You want the event-handling methods described in this chapter to write detailed messages to an error log for use in debugging your application, but you want to display friendly, informative messages to the user.
Create a custom exception class that includes a property to hold the
user-friendly message, and then, when an error occurs, instantiate a
new exception object of the custom type in the
Catch block of your error-handling code, set the
property of the exception to the desired message, and then throw the
Use the .NET language of your choice to create the custom exception
class by deriving from
and adding a property to hold the user-friendly message, giving it a
In the code-behind for the ASP.NET pages of your application that need to perform error handling, use the .NET language of your choice to:
Catch block of methods where informative
messages are useful, instantiate a new exception object of your
custom class type, set the
property to the desired message, and then throw the new exception.
Application_Error event handler, write the
detailed information provided by the exception object to the event
log and then display the message contained in the
userFriendlyMessage property of the exception on a
common error message page.
The custom exception class we’ve created to demonstrate this solution is shown in Example ...