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const int GWL_EXSTYLE = -20;
const int WS_EX_TOOLWINDOW = 0x00000080;
[DllImport("user32.dll")]
static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
[DllImport("user32.dll", SetLastError = true)]
static extern int GetWindowLong(IntPtr hWnd, int nIndex);
// verstecken durch diesen Aufruf
SetWindowLong(this.Handle, GWL_EXSTYLE, GetWindowLong(this.Handle, GWL_EXSTYLE) | WS_EX_TOOLWINDOW);
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