如何在用C#在picturebox上用鼠标画线
如题　大家帮忙　我搜索了很多　但都是不是很清楚或者说我用的方法不对　private       void       pictureBox1_Paint(object       sender,       System.Windows.Forms.PaintEventArgs       e)      
{       ｝
是把代码写在这里面吗？
怎么没有反应呢　好象不起作用　大家帮忙

------解决方案--------------------
public partial class Form1 : Form
{
private Point m_ptStart = new Point(0,0);
private Point m_ptEnd = new Point(0, 0);


private bool m_bMouseDown = false;

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{

}

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (!m_bMouseDown)
{
m_ptStart = new Point(e.X, e.Y);
m_ptEnd = new Point(e.X, e.Y);
}
m_bMouseDown = !m_bMouseDown;
}

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (!m_bMouseDown) return;
m_ptEnd = new Point(e.X, e.Y);
this.pictureBox1.Refresh();
}

private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
if (m_ptStart.Equals(m_ptEnd)) return;

e.Graphics.DrawLine(System.Drawing.Pens.Black, m_ptStart, m_ptEnd);
}
}
够明白不？
------解决方案--------------------
当然不能直接拷贝啦，你可能根本没有触发gudyn(子剑) 写的那三个事件。你选择pictureBox添加那三个事件。