[DllImport("user32")]
private static extern bool ReleaseCapture();
[DllImport("user32")]
private static extern int SendMessage(IntPtr hWnd, int Msg, int wp, int lp);
public struct NCHITTEST
{	public const int Left = 10;	public const int Right = 11;	public const int Top = 12;	public const int TopLeft = 13;	public const int TopRight = 14;	public const int Bottom = 15;	public const int BottomLeft = 16;	public const int BottomRight = 17;
}
protected override void OnMouseDown(MouseEventArgs e)
{	base.OnMouseDown(e);	if (e.Button == MouseButtons.Left) {	ReleaseCapture();	// for the 'wp' parameter, just replace 'BottomRight' with your direction	SendMessage(Handle, 161, NCHITTEST.BottomRight, 0); }
}