[此贴子已经被作者于2007-9-12 16:02:36编辑过]

谢谢你的答复。问题是不能在groupBox7中画图，如果是在Form1中定义graphics对象，那么是可以的。但是我想在groupBox7中画图。再帮我想想？怎么解决？谢谢！

public partial class Form1 : Form
{
PortControl MB = new PortControl();
Graphics g;

public Form1()
{
InitializeComponent();

}

private void groupBox7_Paint(object sender, PaintEventArgs e)
{
g = e.Graphics;
......

}
private void timer1_Tick(object sender, EventArgs e)
{
.......
g.DrawLine(new Pen(new SolidBrush(Color.Red), 1), 25,41,12,19);//报错：参数错误
.......
}

[此贴子已经被作者于2007-9-12 12:41:00编辑过]

嗨，还是没搞明白怎么做，总是编译出错，能否写的祥细点呀，或者有没有例程？刚接触高级语言编程，一头雾水。