C#WinForm仿qq窗体拖到windows窗体边上时，自动隐藏C#WinForm

C#WinForm仿qq窗体拖到windows窗体边上时，自动隐藏C#WinForm。代码：

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
            System.Windows.Forms.Timer StopRectTimer = new System.Windows.Forms.Timer();
            StopRectTimer.Tick += new EventHandler(timer1_Tick);
            StopRectTimer.Interval = 50;
            StopRectTimer.Enabled = true;
            this.TopMost = true;
            StopRectTimer.Start();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (this.Bounds.Contains(Cursor.Position))
            {
                switch (this.StopAanhor)
                {
                    case AnchorStyles.Top:
                        this.Location = new Point(this.Location.X, 0);
                        break;
                    case AnchorStyles.Left: