C#截取某一范围的图

 private void button2_Click(object sender, EventArgs e)
        {
           Rectangle tScreenRect = new Rectangle(0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
           tScreenRect.Width = 50;
           tScreenRect.Height = 30;
           Bitmap tSrcBmp = new Bitmap(tScreenRect.Width, tScreenRect.Height); // 用于屏幕原始图片保存
           Bitmap tSrcBmp1 = new Bitmap(tScreenRect.Width, tScreenRect.Height); // 用于屏幕原始图片保存
           Graphics gp = Graphics.FromImage(tSrcBmp);
           Graphics gp1 = Graphics.FromImage(tSrcBmp1);
            //string Text1 = Cursor.Position.X.ToString();
            //string Text = Cursor.Position.Y.ToString();
            //int x = int.Parse(Text1);
            //int y = int.Parse(Text);
            
            gp.CopyFromScreen(1257, 300, 0, 0, tScreenRect.Size);
            gp.DrawImage(tSrcBmp, 0, 0, tScreenRect, GraphicsUnit.Pixel);
            gp1.CopyFromScreen(1306, 300, 0, 0, tScreenRect.Size);
            gp1.DrawImage(tSrcBmp1, 0, 0, tScreenRect, GraphicsUnit.Pixel);
 
 
 
            tSrcBmp.Save(@"F:/VC++程序/Cmouse/22.png");
            tSrcBmp1.Save(@"F:/VC++程序/Cmouse/33.png");
        }