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Question: How Do I set up a global exception handler for my application?

Answer:

To set up a global exception handler for your application, write your exception handling code in the ApplicationError event handler that is implemented in Gloabal.asax. This event is raised when exceptions are allowed to propagate from page-level error handlers or if there is no page error handler. Ideally, the exception handling code you write in the ApplicationError method will collect and log as much exception details necessary for you to diagnose the error.
An unhandled exception might leave your application in an unstable and un-usable form, hence as a fall back mechanism you should always implement a global exception handler.
A sample global exception handler that writes exception details to the event log is shown below:

		 <%@ Application Language="C#" %>
		 <%@ Import Namespace="System.Diagnostics" %>
	

		 <script language="C#" runat="server">
		 void Application_Error(object sender, [EventArgs] e)
		 {
		   //get reference to the source of the exception chain
		   Exception ex = [Server.GetLastError().GetBaseException();] 
	

		   //log the details of the exception and page state to the
		   //Event Log
		   EventLog.WriteEntry("My Web Application",
		     "MESSAGE: " + ex.Message + 
		     "\nSOURCE: " + ex.Source +
		     "\nFORM: " + [Request.Form.ToString()] + 
		     "\nQUERYSTRING: " + [Request.QueryString.ToString()] +
		     "\nTARGETSITE: " + [ex.TargetSite] +
		     "\nSTACKTRACE: " + [ex.StackTrace,] 
		     [EventLogEntryType.Error);]
	

		   //Optional email or other notification here...
		 }
		 </script>
	

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