怎样在一个picturebox上画出一个坐标系？

[木弓]

如题，我打算在picturebox旁边加一个button，当点击button时，picturebox上就画出一个坐标系。请问该如何实现呢？我刚学C#，能有代码最好。

[cnfixit]

private void button1_Click(object sender, EventArgs e)
{
    Graphics g = Graphics.FromHwnd(this.pictureBox1.Handle);
    g.DrawLine(new Pen(Brushes.Black), 20, 0, 20, 200);
    g.DrawLine(new Pen(Brushes.Black), 20, 200, 200, 200);     
}

[智者知已应修善业]

http://blog.csdn.net/xianfajushi/article/details/7493697