Asp.Net Repeater中使用Button控件并响应单击操作的方法

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            string[] s = new string[] { "1", "2", "3", "4", "5" };

            this.rptTest.DataSource = s;
            this.rptTest.DataBind();
        }
    }
    protected void TestBtn(object sender, EventArgs e)
    {
        Button bt = sender as Button;

        RepeaterItem ri = bt.Parent as RepeaterItem;

        TextBox tx = ri.FindControl("txt") as TextBox;
        if (!object.Equals(tx, null))
        {
            Response.Write(tx.Text);
        }
        
    }