Custom 404 Message with Bad URL Parameters


Have you ever built a site that contains a page that accepts a parameter like http://mycommecesite/productdetails.aspx?pid=10?  What happens when a user tries to enter an invalid product id?  It would be nice if you could show them a nice custom error page with very minimal coding. Turns out you can do this with as little as 2 lines of code.  The first step is to configure a custom 404 page in web.config file in the <customErrors> section. So whenever user requests non-existent aspx page, ASP.NET run-time returns well formatted message to the user.


The next step is to throw the proper exception and let ASP.Net handle the request for you and display a nice friendly message to your user.  All that needs to be done is to throw HttpException like:


    throw new HttpException(404, "Article not found");


The ASP.NET run-time will catch the exception and will redirect to the custom 404 page and now your site behaves well and consistent!

Comments (1)
  1. Very cool.  Reminds me of the custom validator trick.

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