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            CSIDL_WINDOWS           = 0x0024,    // GetWindowsDirectory()

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        CSIDL_WINDOWS         = 0x0024,    // GetWindowsDirectory()

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        CSIDL_WINDOWS       = 0x0024,    // GetWindowsDirectory()

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   if (0 == GetWindowsDirectory(winDir, winDir.Capacity)) return (false);

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Summary

The GetWindowsDirectory API

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static extern uint GetWindowsDirectory(StringBuilder lpBuffer,

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<DllImport("kernel32.dll", SetLastError:=true, EntryPoint:="GetWindowsDirectoryW", CharSet:=CharSet.Unicode)> _

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Public Function GetWindowsDirectory(<MarshalAs(UnmanagedType.LPTSTR)>lpBuffer As System.Text.StringBuilder, _

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Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" _

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   Dim Res As Integer = GetWindowsDirectory(WinDir, WinDir.Length)

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     GetWindowsDirectory(sb,i)

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   int len = (int)GetWindowsDirectory(sb, MaxPathLength);

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     GetWindowsDirectory(sb,ref  i);

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Documentation

[GetWindowsDirectory] on MSDN