In this tutorial, you will find a step by step instruction how to add ELMAH (Error Logging Modules and Handlers for ASP.NET) to your existing ASP.NET MVC application. ELMAH is an easy-to-plug in library that logs and reports unhandled exceptions in ASP.NET application. It is described as follows:

ELMAH (Error Logging Modules and Handlers) is an application-wide error logging facility that is completely pluggable. It can be dynamically added to a running ASP.NET web application, or even all ASP.NET web applications on a machine, without any need for re-compilation or re-deployment.

I’ve tested the steps below with ASP.NET MVC 2 and ASP.NET MVC 3 applications, but they may work also for other types of ASP.NET applications.

First you have to download ELMAH from the download page. After adding a reference to Elmah.dll in your project, all you have to do is to add the ELMAH configuration to your Web.config.

The example configuration shown above includes two customizings I found very useful for web applications:

• If the server returns a status code between 400 (included) and 500 (excluded), ELMAH ignores the exceptions.
• A remote access to the /elmah.axd web interface is enabled for specific (admin) users.

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