private static void ActivateOtherWindow(string windowName)
        {
            var other = FindWindow(null, windowName);
            if (other != IntPtr.Zero)
            {
                SetForegroundWindow(other);
                if (IsIconic(other))
                    OpenIcon(other);
            }
        }
        
        [DllImport("user32", CharSet = CharSet.Unicode)]
        static extern IntPtr FindWindow(string cls, string win);
        [DllImport("user32")]
        static extern IntPtr SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32")]
        static extern bool IsIconic(IntPtr hWnd);
        [DllImport("user32")]
        static extern bool OpenIcon(IntPtr hWnd);