ClipCursor: курсор не удерживается в заданных координатах - C#

[DllImport("user32.dll")]
private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, int vk);
[DllImport("user32.dll")]
private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
[DllImport("user32.dll")]
private static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);
[DllImport("user32.dll")]
unsafe private static extern bool ClipCursor(Rectangle *rect);
 
public Form1()
        {
            InitializeComponent();
            RegisterHotKey(this.Handle, 1, 0, 0x46); //HotKey - F
            unsafe
            {
                Rectangle block = new Rectangle(0, 0, 100, 200);
                Rectangle* rect = █
                ClipCursor(rect);
            }
        }