c#中在代码中定义了一个Button控件，如何添加该控件的单击事件。该事件的作用是使另一个也是自己在代码中定义的Label控件的Text属性设为“取消”。谢谢了呀

using System;
using System.Drawing;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            var lbl = new Label {Text = "LabelText"};
            Controls.Add(lbl);
            var but = new Button
                          {
                              Text     = "ButtonText",
                              Tag      = lbl,
                              Location = new Point(lbl.Location.X, lbl.Location.Y + lbl.Height)
                          };
            but.Click += But_Click;
            Controls.Add(but);
        }
        void But_Click(object sender, EventArgs e)
        {
            ((Label) ((Button) sender).Tag).Text = "取消";
        }
    }
}

不甚感激，真的好谢谢你！！