pinvoke.net: Edit: user32.setwindowrgn

@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$
@pinvoke=http://pinvoke.net/$$$.htm

Summary: The SetWindowRgn API

!!!!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
!!!!User-Defined Types:
None.

!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

Rounded form:

[DllImport("user32.dll")]
static extern int SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);
		
[DllImport("gdi32.dll")]
static extern IntPtr CreateRoundRectRgn(int x1, int y1, int x2, int y2,int cx, int cy);

private void Form1_Load(object sender, System.EventArgs e)
{
SetWindowRgn (this.Handle, CreateRoundRectRgn ( 0, 0, 562, 257, 20, 20 ),true);
}

!!!!Sample Code:
Please add some!

!!!!Alternative Managed API:

You can use the TransparencyKey property on a Windows form to achieve the same effect.
You can also use the Region property of a Windows form to change the shape of the client area.

Documentation: SetWindowRgn@msdn on MSDN