SetWindowRgn

C# Signature:

[DllImport("user32.dll")]
static extern int SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);

VB.NET Signature:

<DllImport("user32.dll")> _
Public Function SetWindowRgn(ByVal hWnd As Long, ByVal hRgn As IntPtr, ByVal bRedraw As Boolean) As Long
End Function