几个小问题，蛮基础的。百度过了，没有答案，特来求解答。
1 
以下代码button2_Click与 button3_Click为button2与button3已绑定事件处理程序，当用户轮流点击button2和button3若干次后，再点击button1时出现系统CPU100%，请问为什么？应如何解决？
private void button2_Click(object sender, EventArgs e)
{
this.button1.Click += new EventHandler(button1_Click);
}
private void button3_Click(object sender, EventArgs e)
{
this.button1.Click -= new EventHandler(button1_Click);
}
private void button1_Click(object sender, EventArgs e)
{
this.Text = DateTime.Now.ToString();
}
2
以下代码button2_Click与 button3_Click为button2与button3已绑定事件处理程序，当用户轮流点击button2和button3若干次后，再点击button1时出现系统CPU100%，请问为什么？应如何解决？
private void button2_Click(object sender, EventArgs e)
{
this.button1.Click += new EventHandler(button1_Click);
}
private void button3_Click(object sender, EventArgs e)
{
this.button1.Click -= new EventHandler(button1_Click);
}
private void button1_Click(object sender, EventArgs e)
{
this.Text = DateTime.Now.ToString();
}






------解决方案--------------------
+= 累加.这样的问题,debug下,看下程序执行流程就知道了.