多个按钮执行相同事件（委托）

this.button2.Click += new System.EventHandler(this.button2_Click);
this.button3.Click += new System.EventHandler(this.button2_Click);
this.button4.Click += new System.EventHandler(this.button2_Click);

private void button2_Click(object sender, EventArgs e)
{
Button btn = sender as Button;
if(btn.Name=="Button1")
{
//jj
}
}