Question

I am working on a current web app and we would like to determine if the page being requested is correct or not, we do this in a Global.asax on the Application_BeginRequest method, we check for the urls such as if someone enters http://mywebtest/badurl then we send them to a custom 404 page, but we are having trouble making it work when it has a .aspx extension, there are pages that are good with aspx extensions but others that do not exist should be fowarded to the custom 404. How can we do this?

If a page with .aspx is requested that does not exist, 
to redirect it to the custom 404  page?

I was trying something like (but its just a guess) and it did not work..

if ((string)System.IO.Path.GetExtension(Request.Path) == string.Empty)
                    {
                        HttpContext.Current.RewritePath("~/custom404.aspx");
                    }

Thank you

Answer 1

Check out these links:

File.Exists method

Check if URL exists

Display a Custom Error Page