Repeater取不到服务端控件

<td>
      　　<asp:Button ID="Button1" runat="server" Text="查看" OnClientClick="return confirm('确定要查看吗?');" CommandName="del"                    CommandArgument='<%#Eval("Telephone")%>' CssClass="btn btn-primary" />
　　　　<asp:Label ID="lab" runat="server" Text="" ></asp:Label>
</td>

实现功能,点击ItemTemplate按钮把键值带过去,隐藏按钮让lable显示出相应的文字!

Repeater1.ItemCommand += Repeater1_ItemCommand;//查看

void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
{
　　if (e.CommandName == "del")
　　{
　　((Button)e.Item.FindControl("Button1")).Visible = false;
　　string id = e.CommandArgument.ToString();
　　((Label)e.Item.FindControl("lab")).Text = id;
}
}