Application_error in the global.asax does not run.

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C#

ASP.NET

C#4.0

Hi EveryOne

I am working on a project, where I have to handle error handling globally using Global.asax function

"void Application_Error(object sender, EventArgs e) "

My code in the Global.asax file is like this:

void Application_Error(object sender, EventArgs e)
   {
       // Code that runs when an unhandled error occurs
       DBUtill dbobj = new DBUtill(); // This is my class for all sorts of
                                      // functionality for my project
       dbobj.App_Error();  // This is my function where i am saving the error
                           // To a database.
   }

From one of my pages in the load event i am throwing unhandled exception just to check whether it is working or not. like below

throw (new ArgumentNullException());

For the purpose of easiness i am including my App_Error function also

public void App_Error()
   {

       Exception ex = HttpContext.Current.Server.GetLastError().GetBaseException();

       string sql = string.Format("insert into tbl_ApplicationErrors (ErrorType,ErrorPage,ErrorDetail) values ('{0}','{2}','{2}')", ex.Source.Replace("'", ""), HttpContext.Current.Request.Url.ToString().Replace("'", ""), ex.ToString().Replace("'", ""));
       ScalarSql(sql);
       HttpContext.Current.Server.ClearError();
       HttpContext.Current.Response.Redirect("~/Error.aspx");
   }

By the first and second time it went right and also inserted values in the database, I mean the Application_Error function fired by the first and second time, but onward it is not working.

What should be the problem, each and every solution will be appreciated.