C# Signature:

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

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

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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:

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Alternative Managed API:

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