讓Form 2 Show出來的時候跟Form 1位置一樣

                                // 跳轉到 homepage 
                                this.Hide(); 
                                HomePage home = new HomePage(); // 把要跳轉過去的頁面new出來 -> home
                                // 把目前頁面位置存到home page
                                home.StartPosition = FormStartPosition.Manual;
                                home.Location = new Point(this.Location.X, this.Location.Y);
                                home.Show();