Parser Error

I am trying to run my first ASP application but I get an error message.  Its a very simple program. The C# code is following :-


using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace WebApplication1
{
    public class WebForm11 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.TextBox TextBox1;
        protected System.Web.UI.WebControls.Button Button1;
        protected System.Web.UI.WebControls.Label Label1;
        
        protected void Page_Loa ...