private void button1_Click(object sender, System.EventArgs e)
{
Graphics g = this.CreateGraphics();
Pen pen = new Pen(Color.Red);
g.DrawLine(pen,10,10,100,100);
}

你再去试试看，我做了可以 啊

老兄，你太帅了～～我刚试完，没问题！

谢谢，谢谢