public const int HWND_BOTTOM = 1;
public const int SWP_NOSIZE = 1;
public const int SWP_NOMOVE = 2;
public const int SWP_NOACTIVATE = 16;
public const int SWP_SHOWWINDOW = 64;
[DllImport("User32.dll")]
public static extern void SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
public void SetBottomMost(IntPtr hWnd)
{
SetWindowPos(hWnd, 1, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_SHOWWINDOW | SWP_NOMOVE | SWP_NOSIZE);
}