pinvoke.net: Edit: kernel32.GetVersion

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Summary: Obtains extended information about the version of the operating system that is currently running.

!!!!C# Signatures:
 // This must be used if OSVERSIONINFO is defined as a struct or Class - The previous [In,Out] parameter defined for
 // a class could cause buffer overrun errors.
 [ DllImport( "kernel32" )] 
 static extern bool GetVersionEx( ref OSVERSIONINFO osvi );

!!!!VB.Net Signatures:
' This must be used if OSVERSIONINFO is defined as a struct
 <DllImport("kernel32")> _
 Private Shared Function GetVersionEx(ByRef osvi As OSVERSIONINFO) As Boolean
 End Function
 
 ' This must be used if OSVERSIONINFO is defined as a class
 <DllImport("kernel32")> _
 Private Shared Function GetVersionEx(<[In](), Out()> ByVal osvi As OSVERSIONINFO) As Boolean
 End Function

!!!!User-Defined Types:
[OSVERSIONINFO]

!!!!Notes:
None.

!!!!Tips & Tricks:
If you forget to set the OSVersionInfoSize field of the OSVERSIONINFO struct, the function will return false. GetLastError() will return:

127
ERROR_PROC_NOT_FOUND
"The specified procedure could not be found."

!!!!Sample Code:
Using the OSVERSIONINFO class and corresponding signature:
 Console.WriteLine( "\nPassing OSVERSIONINFO as class" );

OSVERSIONINFO osvi = new OSVERSIONINFO();
 osvi.OSVersionInfoSize = Marshal.SizeOf( osvi );

GetVersionEx( osvi );
      
 Console.WriteLine( "Class size:    {0}", osvi.OSVersionInfoSize );
Using the OSVERSIONINFO struct and corresponding signature:

Console.WriteLine( "\nPassing OSVERSIONINFO as struct" );

OSVERSIONINFO osvi2 = new OSVERSIONINFO();
 osvi2.OSVersionInfoSize = Marshal.SizeOf(ref typeof(OSVERSIONINFO) );

GetVersionEx( ref osvi2 );

Console.WriteLine( "Struct size:   {0}", osvi2.OSVersionInfoSize );
!!!!Alternative Managed API:
System.Environment.OSVersion@msdn property

Friend Function IsWinVista() As Boolean
        Dim osInfo As System.OperatingSystem = System.Environment.OSVersion
        Return (osInfo.Platform = PlatformID.Win32NT AndAlso osInfo.Version.Major = 6)
    End Function

Friend Function IsWinXP() As Boolean
        Dim osInfo As System.OperatingSystem = System.Environment.OSVersion
        Return (osInfo.Platform = PlatformID.Win32NT AndAlso osInfo.Version.Major = 5 AndAlso osInfo.Version.Minor >= 1)
    End Function

Documentation: GetVersionEx@msdn on MSDN