避免button处理事件过程中 点击按钮触发事件的方法

 private void button1_Click(object sender, EventArgs e)
          {
            //...处理事件
               for (int i = 0; i < 5; i++)
            {
                Thread.Sleep(1000);
            }
            MessageBox.Show("Hello!");
            this.button1.Enabled = false; Application.DoEvents();
            this.button1.Enabled = true;
        }