c#滚动条控件的应用

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace ccccccccccccc{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void HandleScrool(object sender, ScrollEventArgs e)        {        }        private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)        {            Graphics g = pictureBox1.CreateGraphics();            g.DrawImage(pictureBox1.Image, new             Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height),             new Rectangle(hScrollBar1.Value, vScrollBar1.Value,             pictureBox1.Width, pictureBox1.Height), GraphicsUnit.Pixel);                        }    }}