Overview
[Elmah records webapplication exceptions by configuring httpmoule and httphandler. However, if you do not handle these exceptions, you only record them and report errors by sending emails, to conveniently monitor webapplication exceptions]
Http://www.gotdotnet.com/workspaces/workspace.aspx? F18bab11-162c-4267-a46e-72438c38df6f
HTTP modules and handlers can be used in ASP. net to provide a high degree of componentization for code that is orthogonal to a web application, enabling entire sets of functionalities to be developed, packaged and deployed as a single unit and independent of an application. elmah plugin strates this approach by demonstration of an application-wide error logging 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.
Using HTTP modules and handlers to create pluggable ASP. NET components
[The basic working principle and configuration of httpmodules and handlers described in this article, as well as the specific usage of elmah and its overallProgramFramework]
It also configures the abnormal error record viewing function, with the virtual address domanname/elmah/default. aspx.