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public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HTCAPTION = 2;
[DllImport("user32.dll")]
public static extern int SendMessage(IntPtr hwnd, uint msg, int wParam, int lParam);
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
this.Capture = false;
SendMessage(this.Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
}