Application.Error in Global.asax not being called for Error Code 404

I have created a web application in which if requested page does not exists (error - 404), i redirect the user to centralized error page with following code in Application.Error event in global.asax


//code start
string strRequestedURLWithQueryString = ((System.Web.HttpApplication)(sender)).Request.Url.AbsoluteUri;
Server.ClearError();
Server.Transfer("~/Error.aspx?RequestedURL=" + Server.UrlEncode(strRequestedURLWithQueryString));
//code End


When I run the appication from direct source file (without publishing), above code works fine, however when i deployed the application to the production server (after publishing) it does not takes the user to the page Error.aspx.

Can anyone comment on the same?

Thanks in advance

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