adding messagbox in asp.net web application when using updatepanel

Refer

http://www.aspsnippets.com/Articles/Display-MessageBox-in-ASP.Net-using-JavaScript.aspx

http://www.aspsnippets.com/Articles/ASPNet-Server-Side-Yes-No-Confirmation-Box-using-JavaScript.aspx

 i have gone thr' it

i want to place the mesage box / alert in code behind before the start of the code & after excution  just for checking across the internet  as debugging is not possible

i tried

       script = "<script type = 'text/javascript'>alert('Before  =1');</script>";

but its not working

You need to do the way as shown in the links i gave you.

I TRIED THIS

but i am not getting the message /alert box

string message = "Your request is being processed.";

  System.Text.StringBuilder sb = new System.Text.StringBuilder();

  sb.Append("alert('");

  sb.Append(message);

  sb.Append("');");

  ClientScript.RegisterOnSubmitStatement(this.GetType(), "alert", sb.ToString());

i am not getting any popup

Seems you are calling this in updatepanel? Please do specify all details when asking question

change the last line to below to make it work inside updatepanel

ScriptManager1.GetRegisteredStartupScripts(this.GetType(), "alert", sb.ToString());