Kaotic Reality

Getting Mimetype .NET

2011-10-29T12:19:00.000-07:00

Private Function MimeType(Filename As String) As String
 Dim mime As String = "application/octetstream"
 Dim ext As String = System.IO.Path.GetExtension(Filename).ToLower()
 Dim rk As Microsoft.Win32.RegistryKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext)
 If rk IsNot Nothing AndAlso rk.GetValue("Content Type") IsNot Nothing Then
  mime = rk.GetValue("Content Type").ToString()
 End If
 Return mime
End Function

In short - you just feed it with path top a file - and get back the mime type.ExMimeType("f:\\theimage.jpg") --->>> "image/jpeg"

The Life and Times of Windows XP

2011-10-26T23:53:00.000-07:00

Check out this article on the lifetime of windows XP...

http://arstechnica.com/microsoft/news/2011/10/ten-years-of-windows-xp-how-longevity-became-a-curse.ars

Check For 64bit Operating System VB.NET 2.0

2011-10-16T23:38:00.000-07:00

    Public Function Is64BitOperatingSystem() As Boolean?
        Dim amount As Integer
        Try
            amount = Runtime.InteropServices.Marshal.SizeOf(IntPtr.Zero)
            If amount = 8 Then : Return True
            Else : Return False
            End If
        Catch ex As Exception
            Return Nothing
        End Try
    End Function 'End Method Is64BitOperatingSystem

Count Lines in File

2011-10-12T00:18:00.000-07:00

The fastest solution + holds only 1 line at a time in the memory (best solution)

Private Function TotalLines(filePath As String) As Integer
 Using r As New StreamReader(filePath)
  Dim i As Integer = 0
  While r.ReadLine() IsNot Nothing
   i += 1
  End While
  Return i
 End Using
End Function

Retrieve Environment Variables

2011-06-19T12:14:00.001-07:00

   1: ''' <summary>   2: ''' Class to retrieve environment variables and custom declared variables with following format %VARIABLE%   3: ''' </summary>   4: ''' <remarks>A class used to read a string and transform all known variables with format %VARIABLE%,returning the converted string</remarks>   5: Public Class VariableRetriever   6:     7:     #Region "Methods"   8:     9:     ''' <summary>  10:     ''' Converts all known variables with format %VARIBALE% in the provided string  11:     ''' </summary>  12:     ''' <param name="str">Provide a string to transform</param>  13:     ''' <returns>Returns the converted string</returns>  14:     ''' <remarks>If an error occurs an empty string will be returned</remarks>  15:     Protected Friend Shared Function GetAllVarFromString(ByVal str As String) As String  16:         'try to get all the special %xxx% from the string  17:         'replace and rebuild string  18:         Try  19:           20:             Dim split() As String = Nothing  21:             Dim i As Integer = 0  22:             Dim var As String = Nothing  23:             Dim firstindex As Integer = Nothing  24:             Dim secondindex As Integer = Nothing  25:             If Not String.IsNullOrEmpty(str) Then  26:                 If str.Contains("%") Then  27:                     Do Until str.Contains("%") = False  28:                         firstindex = Nothing  29:                         secondindex = Nothing  30:                         var = Nothing  31:    32:                         firstindex = str.IndexOf("%")  33:                         If Not firstindex = -1 Then  34:                             secondindex = str.IndexOf("%", firstindex + 1)  35:                             If Not secondindex = -1 Then  36:                                 var = str.Substring(firstindex + 1, secondindex - firstindex - 1)  37:                                 ReDim Preserve split(i)  38:                                 split(i) = str.Substring(0, firstindex)  39:                                 i = i + 1  40:                                 ReDim Preserve split(i)  41:                                 split(i) = GetVar(var)  42:                                 str = str.Remove(0, secondindex + 1)  43:                                 i = i + 1  44:                             End If  45:                         End If  46:                     Loop  47:                     ReDim Preserve split(i)  48:                     split(i) = str  49:                     If Not split.Length > 0 Then  50:                         Return str  51:                     Else  52:                         Return Join(split, "")  53:                     End If  54:                 Else  55:                     Return str  56:                 End If  57:             Else  58:                 Return str  59:             End If  60:         Catch ex as Exception  61:             Return ""  62:         End Try  63:     End Function 'End Method GetAllVarFromString  64:    65:     ''' <summary>  66:     ''' Converts a %VARIABLE% to it's value  67:     ''' </summary>  68:     ''' <param name="variable">Provide a variable %VARIABLE% as string</param>  69:     ''' <returns>Returns converted string</returns>  70:     ''' <remarks></remarks>  71:     Protected Friend Shared Function GetVar(ByVal variable As String) As String  72:         Try  73:             If Not String.IsNullOrEmpty(variable) Then  74:                 variable = RemoveProcents(variable)  75:                 'Here you can add some variables  76:                 'A few examples %APPPATH% will return the application startup path  77:                 '%APPNAME% just gets the filename without extension  78:                 Select Case UCase(variable)  79:                     Case "APPPATH"  80:                         Return Application.StartupPath  81:                     Case "APPNAME"  82:                         Return IO.Path.GetFileNameWithoutExtension(Application.ExecutablePath)  83:                     Case Else  84:                         Return Environment.GetEnvironmentVariable(RemoveProcents(variable))  85:                 End Select  86:             Else : Return variable  87:             End If  88:    89:         Catch ex As Exception  90:             Return ""  91:         End Try  92:     End Function 'End Method GetVar  93:       94:     ''' <summary>  95:     ''' Removes all % characters in a string  96:     ''' </summary>  97:     ''' <param name="str">Provide a string</param>  98:     ''' <returns>Returns a string with % characters stripped</returns>  99:     ''' <remarks></remarks> 100:     Private Shared Function RemoveProcents(ByVal str As String) As String 101:         If Not String.IsNullOrEmpty(str) Then 102:             str = Replace(str, "%", "") 103:         End If 104:         Return str 105:     End Function 'End Method RemoveProcents 106:   107: #End Region 'Methods 108:   109: End Class 'End Type VariableRetriever 110:  

Disclaimer

2011-06-19T07:09:00.000-07:00

   1: #Region "Header"   2: 'Copyright (c) 2011 <a href="http://kaoticreality.blogspot.com">Kraeven</a>   3: '   4: 'Knowledge needs to shared to enlighten the world ~ Kraeven ®   5: '   6: 'Permission is hereby granted, free of charge, to any person obtaining a copy   7: 'of this software and associated documentation files (the "Software"), to deal   8: 'in the Software without restriction, including without limitation the rights   9: 'to use, copy, modify, merge, publish, distribute, sublicense, and/or sell  10: 'copies of the Software, and to permit persons to whom the Software is  11: 'furnished to do so, subject to the following conditions:  12: '  13: 'The above copyright notice and this permission notice shall be included in  14: 'all copies or substantial portions of the Software.  15: '  16: 'THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  17: 'IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  18: 'FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE  19: 'AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER  20: 'LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,  21: 'OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN  22: 'THE SOFTWARE.  23:    24: #End Region 'Header

What happens when you navigate to a URL?

2011-03-24T06:23:00.001-07:00

Browse the net I found a really interesting article about what actually happens when you type in a URL in your browser.

How does the content of website makes its way to your browser for display?

Full Article : http://igoro.com/archive/what-really-happens-when-you-navigate-to-a-url/

In an nutshell:

1. You enter a URL into the browser

2. The browser looks up the IP address for the domain name

The first step in the navigation is to figure out the IP address for the visited domain.

3. The browser sends a HTTP request to the web server

4. The Facebook server responds with a permanent redirect

5. The browser follows the redirect

The browser now knows that “http://www.facebook.com/” is the correct URL to go to, and so it sends out another GET request

6. The server ‘handles’ the request

The server will receive the GET request, process it, and send back a response.

7. The server sends back a HTML response

8. The browser begins rendering the HTML

Even before the browser has received the entire HTML document, it begins rendering the website:

9. The browser sends requests for objects embedded in HTML

10. The browser sends further asynchronous (AJAX) requests

Upgrade Internet Explorer 1.0 to 9.0

2011-03-18T04:08:00.001-07:00

http://www.winrumors.com/man-upgrades-internet-explorer-1-0-to-9-0-video/

Credits go to Andrew Tait

From the same person who made the video about upgrading from windows 1.0 to 7
another nostalgic video taking us way back into Internet Explorers past.

The video shows the install processes and UI for each version of Internet Explorer.

Andrew also tested the various versions at the Acid test pages.

Enable Compiler Extensions in .NET 2.0

2011-03-09T02:52:00.001-08:00

If you get an error like shown below; this is probably due to the downgrade of a project from .NET 3.5 or higher to .NET 2.0

Cannot define a new extension method because the compiler required type 'System.Runtime.CompilerServices.ExtensionAttribute' cannot be found. Are you missing a reference to System.Core.dll?

Extension methods are a new feature in .NET 3.5 (C#3/VB9) that let you appear to "spot weld" new methods on to existing classes.
If you think that the "string" object needs a new method, you can just add it and call it on instance variables.

But how do we accomplish this in .NET 2.0?

VB.NET

' you need this once (only), and it must be in this namespaceNamespace System.Runtime.CompilerServices    <AttributeUsage(AttributeTargets.Assembly Or AttributeTargets.[Class] Or AttributeTargets.Method)> _    Public NotInheritable Class ExtensionAttribute        Inherits Attribute    End ClassEnd Namespace' you can have as many of these as you like, in any namespacesPublic NotInheritable Class MyExtensionMethods    Private Sub New()    End Sub    <System.Runtime.CompilerServices.Extension> _    Public Shared Function MeasureDisplayStringWidth(graphics As Graphics, text As String) As Integer        ' ...      End FunctionEnd Class

// you need this once (only), and it must be in this namespacenamespace System.Runtime.CompilerServices{    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class         | AttributeTargets.Method)]    public sealed class ExtensionAttribute : Attribute {}}// you can have as many of these as you like, in any namespacespublic static class MyExtensionMethods {    public static int MeasureDisplayStringWidth (            this Graphics graphics, string text )    {           /* ... */    }}

Upgrade Windows 1.0 to Windows 7

2011-03-03T03:16:00.001-08:00

http://www.winrumors.com/man-upgrades-windows-1-0-to-windows-7-via-every-other-windows-versions/

I stumbled upon this video of a guy upgrading windows from the first until the last version…
Talk about backward compatibility !!!

The movie shows all details about the installation process of each version of the windows UI from windows 1.0 until windows 7.
The only exception is Windows ME, missing as you can only upgrade to ME or 2000 and not both.

The video creator, Andrew Tait, used VMWare to install each version and started by installing MS-DOS 5.0 to prepare for the Windows 1.0 installation.

If you’re a Windows fan and have 10 minutes free then check-out the nostalgic video below,
thanks to The Next Web for spotting this classic.

FileDB - A C# database to store files

2011-02-15T00:08:00.000-08:00

When browsing through the codeplex website, I found an interesting project.
A simple easy to use storage container, in the past I used QVFS http://www.codeproject.com/KB/vb/QVFS.aspx .
But this project seems to be abandoned. This seems to be very promising, the only thing I'm missing, that is available in QVFS is the ability
to create a folder structure inside the virtual storage file. On the other hand QVFS uses 2 files, 1 info file and a data file as this FileDB uses only 1 file.

Ripped of CodePlex website : http://filedb.codeplex.com/
Credits go to mbdavid http://www.codeplex.com/site/users/view/mbdavid

FileDB - Project Description

FileDB is a free, fast, lightweight C# (v3.5) DLL project to store, retrieve and delete files using a single archive file as a container on disk.
It's ideal for storing files (all kind, all sizes) without databases and keeping them organized on a single disk file.

First stable version was launched
Improvements on concurrent write access
New method: Export - Export all files to a directory

using Numeria.IO;

    var pathDB = @"C:\Temp\MyDB.fdb";
    
    // Creating an empty FileDB archive
    FileDB.CreateEmptyFile(pathDB);
    
    // Store file from input stream
    var info = FileDB.Store(pathDB, "MyFileName.jpg", inputStream);
    // -or- store directly from the file itself
    var info = FileDB.Store(pathDB, @"C:\Temp\MyPhoto.jpg");
    
    // The 'info' variable returned contains information about your file (generated GUID, filename, file-length, mime-type) 
    var fileGuid = info.ID;
    
    // Reading file inside FileDB and writing it on an output stream (also available to write it directly to a file)
    var info = FileDB.Read(pathDB, fileGuid, outputStream);
    
    // Deleting a file
    var ok = FileDB.Delete(pathDB, fileGuid);

FileDB Methods

CreateEmptyFile - Create an empty data file archive
Store - Store from file/stream to the data file
Read - Search a fileID and restore it to output file/stream
Delete - Delete a file
ListFiles - List all files inside the archive
Shrink - Reorganize archive removing unused disk space
Export - Export files inside archive to a directory

All operations have a static method helper or can be used from a FileDB instance.

ASP.NET MVC Example

Below is a basic example to store/retrieve/delete information in a ASP.NET MVC Controller

private string pathDB = @"C:\Temp\MvcDemo.fdb";

    // Uploading a file
    [HttpPost]
    public ActionResult Upload()
    {
        HttpPostedFileBase file = Request.Files[0] as HttpPostedFileBase;

        if (file.ContentLength > 0)
            FileDB.Store(pathDB, file.FileName, file.InputStream);

        return RedirectToAction("Index");
    }

    // Download
    [HttpGet]
    public ActionResult Download(string id)
    {
        // Using a classic way to download a file, instead of FileContentResult mode. 
        // Optimizing for big files. Your webserver will not consume CPU/Memory to download this file (even very large files)

        using (var db = new FileDB(pathDB, FileAccess.Read))
        {
            var info = db.Search(Guid.Parse(id));

            Response.Buffer = false;
            Response.BufferOutput = false;
            Response.ContentType = info.MimeType;
            Response.AppendHeader("Content-Length", info.FileLength.ToString());
            Response.AppendHeader("content-disposition", "attachment; filename=" + info.FileName);

            db.Read(info.ID, Response.OutputStream);

            return new EmptyResult();
        }
    }

Why?

Well, all web developers already had this problem: "I need to store same user files (photos, documents, ...) and I need to save them on my web server. But where? File system or database?"
(See some discussion in http://stackoverflow.com/questions/3748/storing-images-in-db-yea-or-nay#3756)
The problem is: the database was not designed to store files. ADO.NET doesn't have a good method to work with streams (only byte[]).
For small files (less then 100K) it works very nice. But what happens with a 10Mb file? 100Mb? It's terrible! The solution: work on file system!
The file system has a problem too: what if my user wants to upload 300 files? And what if I have 2000 users?
You will have thousands of files to backup and manage, and this will be a pain.
My idea: a single archive (or a single archive per user) to store only user uploaded files.
I use the SQL Server database to store the ID file reference (GUID) and FileDB does the rest of the job, storing and managing the files and bytes.

How FileDB works?

FileDB was designed to be fast, very simple, file-based and works with all file sizes.
FileDB doesn't consume lots of memory because it works only with streams (no byte[]).
The data structure is built with two kinds of pages: IndexPage and DataPage.
- The IndexPage stores information about the file descriptor and it's organized in a binary tree structure.
- The DataPage stores the file bytes.

Both pages have 4096 bytes (plus 100 bytes to file header). Each page has its own header to store information about the data inside the page.
You can delete a file inside the archive and the empty data pages will be used on next insert. Or you can shrink database to get your non-used bytes.
FileDB caches (in memory) only index pages, to be faster on a second search.

Limitations

I've made many tests to check performance and limitations with all file sizes.
To protect against many clients changing data on same archive, FileDB uses read share mode.
This way many users can search/read simultaneously but only one user can write (store/delete) at a time.
FileDB class also implements IDisposable so you can use it inside a using code.

using(var db = new FileDB(pathDB, FileAccess.ReadWrite))
    {
        db.Store(@"C:\Temp\MyPhoto.jpg");
    }

The data size limitations are based on .NET MaxValue constants. FileDB works with UInt32 (4 bytes unsigned), which limits each file to 4GB and the database to 16TB (4096 Pages * UInt32.MaxValue).

How to identify if string contain a number?

2011-01-24T00:38:00.001-08:00

System.Text.RegularExpressions.Regex.IsMatch(input, "\d")

So times you will need to check a string, to see if it contains a number.
What’s the best way to do this?

There are several solutions like this function :

TryParse approach:

Public Shared Function IsNumeric(Expression As Object) As Boolean    Dim isNum As Boolean    Dim retNum As Double    isNum = [Double].TryParse(Convert.ToString(Expression), System.Globalization.NumberStyles.Any, System.Globalization.NumberFormatInfo.InvariantInfo, retNum)    Return isNumEnd Function

Check Characters in String approach:

Public NotInheritable Class Extensions    Private Sub New()    End Sub    <System.Runtime.CompilerServices.Extension> _    Public Shared Function IsNumeric(s As String) As Boolean        For Each c As Char In s            If Not Char.IsDigit(c) AndAlso c <> "."C Then                Return False            End If        Next         Return True    End FunctionEnd Class

What about locales where '.' is the group separator, not the comma (e.g. pt-Br)? What about negative numbers?
Group separators (commas in English)? Currency symbols?
TryParse() can manage all of these as required using NumberStyles and IFormatProvider.

Regular Expressions approach:

System.Text.RegularExpressions.Regex.IsMatch(input, "^\d+$")

This will return true if input is all numbers

If you just want to know if it has one or more numbers mixed in with characters, leave off the ^ + and$.

System.Text.RegularExpressions.Regex.IsMatch(input, @"\d")

Actually I think it is better than TryParse because a very long string could potentially overflow TryParse.

Summary

In my opinion the winner is the Regular Expressions Method

Secunia Personal Software Inspector (PSI)

2011-01-09T23:44:00.001-08:00

Upon stumbling through the web, I found a nice tool to check the installed software for security issues and out-dated programs.
So I thought I’d shared it with you…

http://secunia.com/vulnerability_scanning/personal/

They even have an online scanning tool, so you don’t need to install the application http://secunia.com/vulnerability_scanning/online/

Screenshot PSI application :

FREE PC Security for Home Users

The Secunia PSI is a FREE security tool designed to detect vulnerable and out-dated programs and plug-ins which expose your PC to attacks. Attacks exploiting vulnerable programs and plug-ins are rarely blocked by traditional anti-virus and are therefore increasingly "popular" among criminals.
The only solution to block these kind of attacks is to apply security updates, commonly referred to as patches.
Patches are offered free-of-charge by most software vendors, however, finding all these patches is a tedious and time consuming task.
Secunia PSI automates this and alerts you when your programs and plug-ins require updating to stay secure.
Download the Secunia PSI now and secure your PC today - free-of-charge.

Watch: How to install and use the Secunia PSI 2.0

Current version:
2.0

Latest release:
5th Jan, 2011

File size:
1,737,088 bytes

Alternate download link: ftp://ftp.secunia.com/PSISetup.exe

Older version of the Secunia PSI can be downloaded at:

http://secunia.com/PSI1Setup.exe

System Requirements

The list of requirements that must be met for the Secunia PSI to function correctly are:

Supported Operating Systems (32 & 64 bit):

Microsoft Windows 7
Microsoft Windows Vista SP 1 or later
Microsoft Windows XP - SP 3

Privileges

To install and run the Secunia PSI you require administrative privileges.

Connectivity

Access to Secunia's encrypted servers via SSL (https://psi.secunia.com:443/) and access to Microsoft Windows Update servers,
see also Software Requirements below

Software Requirements

The latest version of Microsoft Update.
You can determine whether or not you are running the latest version by visiting update.microsoft.com.
If you are able to check your system for missing updates through this tool, your system should function properly with the Secunia PSI.

Hardware Requirements:

There are no additional hardware requirements.
If your computer runs any of the above mentioned Operating Systems, then Secunia PSI should work.

VB.NET : Check TextBox For Non-Numeric Values

2010-12-07T07:52:00.001-08:00

Public Function CheckTextBox(ByVal textb As TextBox, ByVal key As KeyPressEventArgs, Optional ByRef err As String = "") As Boolean        Select Case Asc(key.KeyChar)           Case 8 To 15               Return True           Case 48 To 57               Return True           Case 127               Return True           Case Else               err = "Illegal characters have been put in!" + vbCrLf + "Please only use numeric characters."               Return False       End Select   End Function

VB.NET : Sort Collection Made Easy

2010-12-07T02:51:00.000-08:00

Public Function SortStringCollection(ByVal Col As Collection) As Collection        ArrayList.Adapter(Col).Sort()        Return Col    End Function

Test if Integer has been set : Nullable Value Types

2010-11-03T13:10:00.001-07:00

For example, let's say that you have an integer for tracking some value and it can be positive and negative.
It is also possible for the value to be not set yet.
How do you detect that the value hasn't been set yet?
You typically come up with some arbitrary number like 99999999 and hope that the real value is never actually 999999999.
A better way since .NET 2.0, Nullable Value Types

Class [MyClass] Private someValue As System.Nullable(Of Integer)    Public Sub New()someValue = NothingEnd Sub Public Function GetSomeValue() As Integer    If someValue IsNot Nothing Then        Return someValue    Else        Throw New Exception("Some Value has not been set")    End IfEnd Function End Class

This is a much cleaner and safer way than checking for some arbitrary number like 999999999.

Following snippet from Microsoft explains :
http://msdn.microsoft.com/en-us/library/ms235245(v=VS.100).aspx

So what are Nullable Value Types ?

Sometimes you work with a value type that does not have a defined value in certain circumstances.
For example, a field in a database might have to distinguish between having an assigned value
that is meaningful and not having an assigned value.
Value types can be extended to take either their normal values or a null value. Such an extension is called a nullable type.

Each nullable type is constructed from the generic Nullable(Of T) structure.
Consider a database that tracks work-related activities.
The following example constructs a nullable Boolean type and declares a variable of that type.
You can write the declaration in three ways:

Dim ridesBusToWork1? As BooleanDim ridesBusToWork2 As Boolean?Dim ridesBusToWork3 As Nullable(Of Boolean)

The variable ridesBusToWork can hold a value of True, a value of False, or no value at all. Its initial default value is no value at all, which in this case could mean that the information has not yet been obtained for this person. In contrast, False could mean that the information has been obtained and the person does not ride the bus to work.

You can declare variables and properties with nullable types, and you can declare an array with elements of a nullable type.
You can declare procedures with nullable types as parameters, and you can return a nullable type from a Function procedure.

You cannot construct a nullable type on a reference type such as an array, a String, or a class.
The underlying type must be a value type. For more information, see Data Type Implementation (Visual Basic).

How to Use a Nullable Type Variable?

The most important members of a nullable type are its HasValue and Value properties.
For a variable of a nullable type, HasValue tells you whether the variable contains a defined value.
If HasValue is True, you can read the value from Value.
Note that both HasValue and Value are ReadOnly properties.

Default Values

When you declare a variable with a nullable type, its HasValue property has a default value of False. This means that by default the variable has no defined value, instead of the default value of its underlying value type. In the following example, the variable numberOfChildreninitially has no defined value, even though the default value of the Integer type is 0.

Dim numberOfChildren? As Integer

A null value is useful to indicate an undefined or unknown value.
If numberOfChildren had been declared as Integer, there would be no value that could indicate that the information is not currently available.

Storing Values

You store a value in a variable or property of a nullable type in the typical way. The following example assigns a value to the variable numberOfChildren declared in the previous example.

numberOfChildren = 2

If a variable or property of a nullable type contains a defined value, you can cause it to revert to its initial state of not having a value assigned. You do this by setting the variable or property to Nothing, as the following example shows.

numberOfChildren = Nothing

Note

Although you can assign Nothing to a variable of a nullable type, you cannot test it for Nothing by using the equal sign.
Comparison that uses the equal sign, someVar = Nothing, always evaluates to Nothing.
You can test the variable's HasValue property for False, or test by using the Is or IsNot operator.

Retrieving Values

To retrieve the value of a variable of a nullable type, you should first test its HasValue property to confirm that it has a value.
If you try to read the value when HasValue is False, Visual Basic throws an InvalidOperationException exception.
The following example shows the recommended way to read the variable numberOfChildren of the previous examples.

If numberOfChildren.HasValue Then    MsgBox("There are " & CStr(numberOfChildren) & " children.")Else    MsgBox("It is not known how many children there are.")End If

A database is one of the most important places to use nullable types.
Not all database objects currently support nullable types, but the designer-generated table adapters do.
See "TableAdapter Support for Nullable Types" in TableAdapter Overview.

See Also

Tasks
Troubleshooting Data Types (Visual Basic)

Reference
InvalidOperationException
If Operator (Visual Basic)
Is Operator (Visual Basic)
IsNot Operator (Visual Basic)
HasValue

Concepts
Data Types in Visual Basic
TableAdapter Overview
Local Type Inference (Visual Basic)

Other Resources
Data Type Implementation (Visual Basic)

techPhile: Using VB keywords as Variables

2010-11-03T06:54:00.000-07:00

techPhile: Using VB keywords as Variables

Credits goto : Cody Schouten

Using VB keywords as Variables

In C#, a name of a get/set accessor was not a keyword but in VB.Net it was. No matter what libraries or how many different online code converters I tried, I could not get it to work. I finally resorted to google and found out that you can surround a keyword with brackets ([ ]) and than you can use that keyword however you need. In my case it allowed me to use custom sinks in .NET Remoting. Here's an example:

Dim [New] as String
New = "Blah"

As a very BIG note: Be careful when using it. When you can name something other than a reserved keyword, do so. It can cause many issues if you use this unwisely.

VB .NET, C# Code Converter - Fryan's Digital World

2010-10-31T10:54:00.000-07:00

VB .NET, C# Code Converter - Fryan's Digital World

I already had plenty of .NET projects where I use either VB.NET or C# language to write codes. If a client wishes to convert existing VB project to C# or vice-versa then I usually use free VS Studio add-in to do it. But aside from add-ins, there are several web apps that can perform the same task. Here is a list of VB .NET to C# and C# to VB.NET converters I've used in the past.

1. Developer Fusion VB.NET to C#

2. KamalPatel.Net - Convert C# to VB .NET. An offline version with full source code is also available for download.

3. Code Translation for .NET (C#-VB.NET)

Take note that all this web apps doesn't make a copy of your sourcode to protect your intellectual right. Everything is processed in the server's memory and returned immediately to the browser.

mRemote : multi-tab remote connections manager

2010-10-06T02:36:00.001-07:00

mRemote is a full-featured, multi-tab remote connections manager.

http://www.mremote.org/wiki/

It allows you to store all your remote connections in a simple yet powerful interface.

Currently these protocols are supported:

RDP (Remote Desktop)
VNC (Virtual Network Computing)
ICA (Independent Computing Architecture)
SSH (Secure Shell)
Telnet (TELecommunication NETwork)
HTTP/S (Hypertext Transfer Protocol)
Rlogin (Rlogin)
RAW

mRemote is a multi-tab, multi-protocol remote connections mananger written mainly in VB.NET and some bits in C# 2.0.

External Programs can be used, for example Dameware :

Features

Free and Open Source, released under the GPL
Panels and tabs allow to group certain connections together, dock them to any side of the window or completely undock them and move them to another screen for example
Multiple supported protocols (RDP, VNC, ICA, SSH, Telnet, RAW, Rlogin and HTTP/S)
Easy to organize and maintain list of connections
Inheritance makes it possible to store properties on folder basis and let the underlying connections inherit this info
Support for importing connections from Active Directory
Allows creating nested containers (folders) to categorize connections
"Quick Connect" feature to quickly open a connection without creating an entry
"Quick Search" feature to quickly find a connection while typing
Support for SCP/SFTP (SSH) file transfers
Assign icons to connections to easily identify purpose
Screenshot manager allows to collect multiple screenshots and save them all together or copy them to the clipboard
View remote session info and log off sessions (RDP)
Portable
Auto-Reconnect feature
"Auto-Update" feature
SQL Server support
Show description tooltips when hoovering over connections
System tray icon with connection menu
Fullscreen (Kiosk) mode
Assign global credentials to use when no information is provided on connection basis
Host Up/Down (Ping) feature shows if the selected host answers to a ping

System Requirements

Supported Operating Systems:
Windows XP
Windows Vista

Prerequisites:

Microsoft .NET Framework 2.0
Microsoft Terminal Services Client 6.0
Needed if you use RDP. mstscax.dll and/or msrdp.ocx must be registered.
PuTTY
Needed if you use Telnet, SSH, Rlogin or RAW. Included in all packages.
Citrix ICA Client
Needed if you use ICA. wfica.ocx must be registered.

ATTENTION!
mRemote was only tested under 32bit environments, so 64bit systems are unsupported but may run mRemote just as usual.

Download mRemote (Change Log)
Downloads are provided in four packages, the setup package, binary package, portable package and the source package.

The setup package is the compiled version of mRemote which comes in the form of a NSIS generated setup. (The common/fastest way to get mRemote up and running)

The portable package consists of the same files as the bin package but contains an modified version of the executable which stores and loads all your settings from files in the application's directory. This package can be used to run mRemote from an USB stick an preserve your configuration wherever you go.

The binary package is a zip package and contains the same files as the setup package but has no automated installer.

The source package is a zip package and contains the mRemote source code.

English Release:

Setup Package

Download V1.50

Portable Package

Download V1.50

Binary Package

Download V1.50

Source Package

Download V0.50

http://www.mremote.org/wiki/Edit.aspx?Page=Downloads&Section=5

Licensing
mRemote is released under the GPL (GNU General Public License)

Licensing

mRemote is released under the GPL (GNU General Public License)

Windows Tip of the Day: Finding the MAC Address of Remote Computer (Advanced)

2010-10-01T05:39:00.000-07:00

Windows Tip of the Day: Finding the MAC Address of Remote Computer (Advanced)

Every device on a TCP/IP network has a unique number assigned to it called the MAC (Media Access Control) address. The MAC address is used by the network hardware such as routers, switches, etc. to send traffic from one device to another device on your network.

Your computer uses a service called ARP (Address Resolution Protocol) to resolve and track the TCP/IP and MAC address of the remote devices that you're communicating with. This information is handy for doing semi-low level network troubleshooting. It can also be used for granting or denying permissions to a network segment or device on that network.

To determine the MAC address of a remote device:

Open the MS-DOS prompt (From the Run... command, type "CMD" and press Enter).

Ping a remote device that you want to find the MAC address (for example: PING 192.168.0.1).

Type "ARP -A", and press Enter.

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\WINDOWS>arp -a

Interface: 192.168.1.100 --- 0x10004
Internet Address Physical Address Type
192.168.1.1 aa-fb-c8-34-da-7a dynamic

Make your application extensible with Reflection

2010-09-21T00:42:00.000-07:00

Public Shared Function LoadAll(Of T)() As List(Of T)

Dim services As New List(Of T)()

For Each type As Type In Assembly.GetCallingAssembly().GetTypes()

If type.IsSubclassOf(GetType(T)) AndAlso Not type.IsAbstract AndAlso Not type.IsInterface Then

services.Add(DirectCast(Activator.CreateInstance(type), T))

End If

Return services

End Function

Start a Process as a Different User - developer Fusion

2010-09-20T02:41:00.000-07:00

Start a Process as a Different User - developer Fusion: "Function ConvertToSecureString(ByVal str As String)

Another usefull code snippet

Credits go to Peter Rekdal Sunde at developerfusion.com

Function ConvertToSecureString(ByVal str As String)
        Dim password As New SecureString
        For Each c As Char In str.ToCharArray
            password.AppendChar(c)
        Next
        Return password
End Function
Sub Main()
       dim username as string = "Administrator"
       dim password as SecureString = ConvertToSecureString("my password")
       dim domain as string = Nothing
       dim filename as string = "notepad.exe" ' %SYSTEMROOT%\system32
        Try
            System.Diagnostics.Process.Start(filename,username, password, domain)
        Catch ex As Win32Exception
            MessageBox.Show("Wrong username or password.", _
  "Error logging in as administrator", MessageBoxButtons.OK, _
   MessageBoxIcon.Error)
        End Try
End Sub

Deep clone an object in .NET - developer Fusion

2010-09-20T02:38:00.000-07:00

Deep clone an object in .NET - developer Fusion

A code snippet that could be very useful, so I though I'd share this with you...

Credits go to James Crowley at developerfusion.com

There are two types of object cloning; deep and shallow.

A shallow clone creates a new instance of the same type as the original object, with all its value-typed fields copied. However, the reference type fields still point to the original objects; and so the "new" object and the original reference to the same object. On the other hand, a deep clone of an object contains a full copy of everything directly or indirectly referenced by the object - and so you get a "true" copy.

One of the easiest ways to deep-copy an object is to serialize the object into memory and de-serialize it again - although this does require the object graph to be serializable. Here's a handy code snippet to do this:

public static object CloneObject(object obj)
{
using (MemoryStream memStream = new MemoryStream())
{
BinaryFormatter binaryFormatter = new BinaryFormatter(null, 
new StreamingContext(StreamingContextStates.Clone));
binaryFormatter.Serialize(memStream, obj);
memStream.Seek(0, SeekOrigin.Begin);
return binaryFormatter.Deserialize(memStream);
}
}

You could then implement the ICloneable interface on your object like so:

public class MyObject  : ICloneable {
public object Clone()
{
return ObjectUtility.CloneObject(this);
}
...
}

InCtrl 5 Application Analysys Tool – Download and Enjoy | Simon Todd's Free Technical Blog!

2010-09-16T03:26:00.000-07:00

InCtrl 5 Application Analysys Tool – Download and Enjoy | Simon Todd's Free Technical Blog!

InCtrl 5 is an amazing application, it is very simple to use and simple in the results it give but it is very very powerful. InCtrl 5 looks for all of the differences before and after an application is installed.

You can download InCtrl 5 here

InCtrl 5 is a great tool for those that build XPe (XP Embedded) development, Application Virtulisation or Terminal Services/Citrix. It allows you to look and see what is added into the Registry and file system, it also shows you what was edited and changed during the installation the the application you are testing.

I have used this product to components XPe applications, work out where an application tries to install its self on a Terminal Server and to double check the tools for Application Visualisation.

A really good an useful tool.

Printer Driver Generator 1.3.0.0 | Novell User Communities

2010-09-14T02:46:00.000-07:00

Printer Driver Generator 1.3.0.0 | Novell User Communities: "Printer Driver Generator 1.3.0.0"

Nice little tool to regenerate a printer INF file...

Credits go to : ukdtom http://www.novell.com/communities/user/277

license:

Free

This is a small tool that I wrote out of need. I do believe that this tool may be of use to others, but it's still in beta phase, and I need feedback from users, Please :-)

Problem:

I have a printer that did not come with an INF-based printer driver,but instead with a setup.exe-based driver / or integrated with Windows. I don't run iPrint, but only Point-And-Print, or NDPS. How do I distribute this driver?

Answer:

Install this program on your PC, and run PDrvGen.exe, select the printer, and select "Generate".An INF-based driver will now be generated!

What's new in version 1.3.0.0:

Gray Cash from the USA had a small, but nice request, that I preserved the version info in the driver, if it was present in the origen driver.
That way, troubleshooting would be a lot easier to do.

PDrvGen will now extract and save the Driver Version info"

What's new in version 1.2.0.0:

Theo Pluym found an HP Driver that wasn't written that well, since it didn't liked a space between the parameters. Since I figured, that other drivers might suffer from the same problem, I corrected PDrvGen to generate inf-files without this.

Download : PDRVGen.zip

Ghostcript PDF Reference & Tips — Milan Kupcevic

2010-09-13T01:27:00.000-07:00

Ghostcript PDF Reference & Tips — Milan Kupcevic

Basic Usage

Convert PostScript to PDF:

gs -q -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=fileout.pdf \     filein.ps

Merge/combine PDF and/or PostScript files:

gs -q -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=fileout.pdf \     filein.ps filein2.pdf

Extract a page from a PostScript or a PDF document:

gs -q -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -dFirstPage=3 -dLastPage=3 \     -sOutputFile=fileout.pdf filein.ps

Additional Options

PDF optimization level selection options

-dPDFSETTINGS=/screen   (screen-view-only quality, 72 dpi images) -dPDFSETTINGS=/ebook    (low quality, 150 dpi images) -dPDFSETTINGS=/printer  (high quality, 300 dpi images) -dPDFSETTINGS=/prepress (high quality, color preserving, 300 dpi imgs) -dPDFSETTINGS=/default  (almost identical to /screen)

Paper size selection options

-sPAPERSIZE=letter -sPAPERSIZE=a4 -dDEVICEWIDTHPOINTS=w -dDEVICEHEIGHTPOINTS=h (point=1/72 of an inch) -dFIXEDMEDIA (force paper size over the PostScript defined size)

Other options

-dEmbedAllFonts=true -dSubsetFonts=false -dFirstPage=pagenumber -dLastPage=pagenumber -dAutoRotatePages=/PageByPage -dAutoRotatePages=/All -dAutoRotatePages=/None -r1200 (resolution for pattern fills and fonts converted to bitmaps) -sPDFPassword=password

Hackers Guide to Being Hacked: How “Bad Guys” Take Control, and How to Take it Back. - hacked, hackers, security, recovery, repair, attack

2010-09-09T01:03:00.000-07:00

Hackers Guide to Being Hacked: How “Bad Guys” Take Control, and How to Take it Back. - hacked, hackers, security, recovery, repair, attack

I've found an interesting blog about preventing/dectecting an attack. So let's blog it, you never know when this will come in handy...

How to Recover from an Attack.

Find the Affected Machine(s).

In some cases, like the website hijack or the "attack page" example, you'll know which machine has been affected. In most cases, however, you're going to have to find it.

The best tool for figuring out which computer has been compromised is netstat. Netstat reveals all the incoming and outgoing connections on a computer, and is available on Linux, Windows, and Mac.

Methodically check all the computers in your network using one of the netstat commands below:

Windows
1:
netstat -an | find "ESTABLISHED"

Mac / Linux
1:
netstat -an | grep ESTABLISHED

This command will show you all the established connections to the computer. It will be fairly obvious which machine is infected when you find it. For example, a Linux server infested with an SSH scanner (a script that breaks into your network, then tries to break into everyone else's) will have tons of connections to other networks with a destination port of 22.

A spam relay will have tons of connections to everywhere with a destination port of 25.

An FTP brute force attacker will have tons of connections to destination port 21.

...and so on.

When you find a machine that you suspect has been infected, run the same command as above again, only this time leave out the n switch:

Windows
1:
netstat -a | find "ESTABLISHED"

Mac / Linux
1:
netstat -a | grep ESTABLISHED

This will allow the system to resolve the IP addresses previously shown to their rDNS equivalents. We're looking for a dead giveaway here: connections to foreign countries. When you see 17 connections from Romania, Russian, Taiwan or some other foreign country, and you are not in that country, it is a dead giveaway.

Lastly, run netstat a final time to find the offending processes:

Windows
1:
netstat -ao | find "ESTABLISHED"

Mac / Linux
1:
netstat -ap | grep ESTABLISHED

Write down the offending processes. We'll need this list later.

Blockade your Network.

By now, you should have already downloaded m0n0wall - as I mentioned, you should have a firewall in the prevention steps. A hardware firewall is your best friend in mitigating the effects of a hack attack. While we originally implement a hardware firewall to keep bad guys out, if you've been compromised, you have a duty to mitigate the damage you are doing by keeping the probes, scans, spam, and other garbage in.

Turn on the outbound firewall, and set it to disallow all outbound traffic except traffic with a destination port of 80 or 443. This allows you to keep surfing the web and access secure sites to get more help and information to recover from the attack, but it keeps all the spam (destination port 25), port scans (many different ports), DoS attacks (ping), BotNets (usually IRC ports), and other nasty stuff from being able to leave your network, which renders them effectively useless to the attacker.

Some Useful Functions

2010-08-26T03:26:00.000-07:00

Sometimes you may want to convert a string into a byte array, or vice versa, especially when you are using the Cryptographic APIs. I have provided three functions here to help you make the conversions. The three functions are:

stringcharToByteArray(): converts a string of characters to a byte array.
stringToByteArray(): converts a string of numbers into a byte array.
byteArrayToString(): converts a byte array into a string.

    Public Function stringcharToByteArray(ByVal str As String) As Byte()        'e.g. "abcdefg" to {a,b,c,d,e,f,g}        Dim s As Char()        s = str.ToCharArray        Dim b(s.Length - 1) As Byte        Dim i As Integer        For i = 0 To s.Length - 1            b(i) = Convert.ToByte(s(i))        Next        Return b    End Function     Public Function stringToByteArray(ByVal str As String) As Byte()        ' e.g. "1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16" to         '{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}        Dim s As String()        s = str.Split(" ")        Dim b(s.Length - 1) As Byte        Dim i As Integer        For i = 0 To s.Length - 1            b(i) = Convert.ToByte(s(i))        Next        Return b    End Function     Public Function byteArrayToString(ByVal b() As Byte) As String        Dim i As Integer        Dim s As New System.Text.StringBuilder()        For i = 0 To b.Length - 1            Console.WriteLine(b(i))            If i <> b.Length - 1 Then                s.Append(b(i) & " ")            Else                s.Append(b(i))            End If        Next        Return s.ToString    End Function

Envisions of Life : Kaotic Reality

2010-08-12T04:06:00.000-07:00

Kaotic Reality is a place where mind, heart and soul combine to seek the inner truth of beeing..
Let us believe in the evolution of the mind and in the energy connecting everything and everyone, with a finale goal, beeing, feeling and sensing everything in the entire universe as it would be like feeling inside yourself..
A new consiousness, awareness is born, as people grow to understand there own psyche..
Something to think about.. ??
Be carefull about new found insights as they turn your life upside down, but it will surely have good reason to. Each following insight will help us gather new visions on how to see life itself and take us one step closer to full awareness of our own beeing...

I don't know why, but I know it's fly, to see a certain sight and cry.. Wheep with all your might, during a whole day of utter fright, of what might be or comes to be, but after that day it's history..
Be what you wanna be, but be the best you can be, that's all anyone can expect you to ever be..

from a Kaotic Reality I will see everything clearly..

Kraeven

Gradient Form - Function

2010-07-19T07:32:00.001-07:00

A simple function to make your form background gradient.

First you need to :

Import System.Drawing.Drawing2D

In the method New() or Load :

' Optimize Painting.  SetStyle(ControlStyles.AllPaintingInWmPaint Or _              ControlStyles.DoubleBuffer Or _              ControlStyles.ResizeRedraw Or _              ControlStyles.UserPaint, _              True)

In the OnPaint Method :

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint         'Creating a new Rectangle as similar width and height of the base form         Dim oRAngle As Rectangle = New Rectangle(0, 0, Me.Width, Me.Height)         'Creating a new Gradient style brush.        'Change the colors here to get different color combination.        '"Drawing.Drawing2D.LinearGradientMode.BackwardDiagonal" can be changed accordingly to get different styles like        'ForwardDiagonal, Horizontal, Vertical.        Dim oGradientBrush As Brush = New Drawing.Drawing2D.LinearGradientBrush(oRAngle, Color.Silver, Color.WhiteSmoke, Drawing.Drawing2D.LinearGradientMode.BackwardDiagonal)         'With the help of fillrectangle function drawing rectangle in to form        e.Graphics.FillRectangle(oGradientBrush, oRAngle) End Sub

Or if you want a function to use for your controls :

Private Function DrawGradientBackground(ByVal Ctrl As Control, ByVal color1 As Color, ByVal color2 As Color, ByVal mode As System.Drawing.Drawing2D.LinearGradientMode) As Boolean    Try        Dim a As New System.Drawing.Drawing2D.LinearGradientBrush(New RectangleF(0, 0, Ctrl.Width, Ctrl.Height), color1, color2, mode)        Dim g As Graphics = Ctrl.CreateGraphics        g.FillRectangle(a, New RectangleF(0, 0, Ctrl.Width, Ctrl.Height))        g.Dispose()        Return True    Catch ex As Exception        MsgBox("Error Creating Gradient!" + Environment.NewLine + ex.Message)        Return False    End TryEnd Function

VB.NET Is Admin Function

2010-07-19T00:17:00.001-07:00

Did you ever want to know if the user has Administrator rights?
Some programs rely on the user to be an administrator, this simple function does just that.

Credits Digital Thunder : http://www.codeproject.com/KB/vb/SysInfo.aspx

Imports System.Security.PrincipalImports System.Threading ' A function to return the Admin status of the user running our program.   Public Function IsAdmin() As Boolean        IsAdmin = False       Dim securityGroup As WindowsPrincipal        ' Get the security credentials of the user that is running our program.       AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal)       securityGroup = CType(Thread.CurrentPrincipal, WindowsPrincipal)        ' Are they a member of the Administrators Group?       If securityGroup.IsInRole(WindowsBuiltInRole.Administrator) Then           IsAdmin = True       End If       Return IsAdmin    End Function

Retrieve Windows Product Key Function

2010-07-19T00:08:00.000-07:00

I found a nice little function to retrieve the Windows Product Key.
Credits go to Digital Thunder : http://www.codeproject.com/KB/vb/SysInfo.aspx

' Usage : GetProductKey("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\")' A function that retrieves the product key used to install Windows.     Public Function GetProductKey(ByVal regKey As String) As String         ' This function will retreive the digital product ID from the registry         ' and decode it into the CD key used to install a Microsoft product.        ' All that is needed is the registry path to the digital proudct ID block        ' for the product in question.         Dim validChars() As String = {"B", "C", "D", "F", "G", "H", "J", "K", "M", _                                      "P", "Q", "R", "T", "V", "W", "X", "Y", "2", _                                      "3", "4", "6", "7", "8", "9"}        Dim CDKey As String = ""         Dim encodedKey(15) As Byte        Dim digitalProductID As Byte()        Dim dpidDataBlock As Object         ' Get the Digital Product ID data-block from the registry.        dpidDataBlock = My.Computer.Registry.GetValue(regKey, "DigitalProductId", 0)         If dpidDataBlock Is Nothing Then Return "Not Available"         digitalProductID = DirectCast(dpidDataBlock, Byte())         ' Extract the encoded CD key (15 bytes) from the digital product ID block.        For n As Integer = 52 To 67            encodedKey(n - 52) = digitalProductID(n)        Next         ' Decode the CD key.        ' Note: The actual CD key is not stored in the registry; only the positions          ' within the validChars() array of the characters that make up the CD key        ' are stored and encoded.         For i As Integer = 28 To 0 Step -1            ' Calculate where the dashes are.            If ((i + 1) Mod 6) = 0 Then                CDKey += " - "            Else                Dim j As Integer = 0                For k As Integer = 14 To 0 Step -1                    Dim Value As Integer = CInt(CLng(j * 2 ^ 8) Or encodedKey(k))                    encodedKey(k) = CByte(Value \ 24)                    ' Position within the validChar() array of the character to add to the CD key string.                    j = Value Mod 24                Next                CDKey += validChars(j)            End If        Next        Return StrReverse(CDKey)     End Function

Kaotic Reality

Getting Mimetype .NET

The Life and Times of Windows XP

Check For 64bit Operating System VB.NET 2.0

Count Lines in File

Retrieve Environment Variables

Disclaimer

What happens when you navigate to a URL?

1. You enter a URL into the browser

2. The browser looks up the IP address for the domain name

3. The browser sends a HTTP request to the web server

4. The Facebook server responds with a permanent redirect

5. The browser follows the redirect

6. The server ‘handles’ the request

7. The server sends back a HTML response

8. The browser begins rendering the HTML

9. The browser sends requests for objects embedded in HTML

10. The browser sends further asynchronous (AJAX) requests

Upgrade Internet Explorer 1.0 to 9.0

Enable Compiler Extensions in .NET 2.0

Upgrade Windows 1.0 to Windows 7

FileDB - A C# database to store files

FileDB - Project Description

ASP.NET MVC Example

Why?

How FileDB works?

Limitations

How to identify if string contain a number?

Secunia Personal Software Inspector (PSI)

FREE PC Security for Home Users

System Requirements

Supported Operating Systems (32 & 64 bit):

Privileges

Connectivity

Software Requirements

Hardware Requirements:

VB.NET : Check TextBox For Non-Numeric Values

VB.NET : Sort Collection Made Easy

Test if Integer has been set : Nullable Value Types

Default Values

Retrieving Values

ConceptsData Types in Visual BasicTableAdapter OverviewLocal Type Inference (Visual Basic)

techPhile: Using VB keywords as Variables

Using VB keywords as Variables

VB .NET, C# Code Converter - Fryan's Digital World

mRemote : multi-tab remote connections manager

Windows Tip of the Day: Finding the MAC Address of Remote Computer (Advanced)

Make your application extensible with Reflection

Start a Process as a Different User - developer Fusion

Deep clone an object in .NET - developer Fusion

InCtrl 5 Application Analysys Tool – Download and Enjoy | Simon Todd's Free Technical Blog!

Printer Driver Generator 1.3.0.0 | Novell User Communities

Ghostcript PDF Reference & Tips — Milan Kupcevic

Additional Options

PDF optimization level selection options

Paper size selection options

Other options

Hackers Guide to Being Hacked: How “Bad Guys” Take Control, and How to Take it Back. - hacked, hackers, security, recovery, repair, attack

Some Useful Functions

Envisions of Life : Kaotic Reality

Gradient Form - Function

VB.NET Is Admin Function

Retrieve Windows Product Key Function

Concepts
Data Types in Visual Basic
TableAdapter Overview
Local Type Inference (Visual Basic)