It is a global interceptor of occurred errors and exclusions in your site that collects detailed info both about an error itself and condition of the system at the moment of the error’s occurrence, sends collected info to an email or records it in a file   Code: ASP.NET v1.0 & C#

Global ASP.NET error handler will output to the browser or email you with a report when the error occurs. The report lists query string, form posts, sessions, application, and cookie collection objects. Only insert 2 lines of code into the global.asax.   Code: ASP.NET v1.0 & VB

Free component to detect and handle exceptions in .NET applications. Fully customizable, works with Windows Forms and ASP.NET. Generates error reports that can be e-mailed to you.   Code: ASP.NET v2.0 & VB

ssException is a robust error handling component for ASP.NET projects. Royalty-free implementation, unlimited projects. Free download.   Code: ASP.NET v1.1 & C#