how to receive a num after user messagebox ?

using System;
using Microsoft.VisualBasic;
using System.Text;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
 
namespace TestWebMsgApp
{
      public class WebMsgBox
      {
            protected static Hashtable handlerPages = new Hashtable();            
            private WebMsgBox()
            {
            }
 
            public static void Show(string Message)
            {
                  if (!(handlerPages.Contains(HttpContext.Current.Handler)))
                  {
                        Page currentPage = (Page)HttpContext.Current.Handler;
                        if (!((currentPage == null)))
                        {
                              Queue messageQueue = new Queue();
                              messageQueue.Enqueue(Message);
                              handlerPages.Add(HttpContext.Current.Handler, messageQueue);
                              currentPage.Unload += new EventHandler(CurrentPageUnload);
                        }
                  }
                  else
                  {
                        Queue queue = ((Queue)(handlerPages[HttpContext.Current.Handler]));
                        queue.Enqueue(Message);
                  }
            }
 
            private static void CurrentPageUnload(object sender, EventArgs e)
            {
                  Queue queue = ((Queue)(handlerPages[HttpContext.Current.Handler]));
                  if (queue != null)
                  {
                        StringBuilder builder = new StringBuilder();
                        int iMsgCount = queue.Count;
                        builder.Append("");
                        handlerPages.Remove(HttpContext.Current.Handler);
                        HttpContext.Current.Response.Write(builder.ToString());
                  }
            }
      }
 
}