WebMsgBox Class

<BACK

WebMsgBox class represents a message box for ASP.NET applications. This class has a static method Show, which is used to display a message box. The Show method takes a single argument of string type, which is the message you want to display.

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("<script language='javascript'>");

                        string sMsg;

                        while ((iMsgCount > 0))

                        {

                              iMsgCount = iMsgCount - 1;

                              sMsg = System.Convert.ToString(queue.Dequeue());

                              sMsg = sMsg.Replace("\"", "'");

                              builder.Append("alert( \"" + sMsg + "\" );");

                        }

                        builder.Append("</script>");

                        handlerPages.Remove(HttpContext.Current.Handler);

                        HttpContext.Current.Response.Write(builder.ToString());

                  }

            }

      }

}