Custom error page setting in asp.net

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ASP.NET4

Hi,
I've a typical question regarding custom error page setting in asp.net

I just trying to display error page on entering wrong url. For that purpose I just set my custom error message in web.config file, with the code :-

<customerrors mode="On">
      <error statuscode="404" redirect="~/Error404.aspx" />
    </customerrors>

This code is fine when I enter wrong url like this:-
http://localhost:21521/wdwkd ----- it opens my Error404.aspx file as i Expected and I m very happy for that :)

But now the problem is when I enter wrong url like this:-
http://localhost:21521/StudentWork.aspx/wdwkd ---- it not only display my Error404.aspx file but also it opens the StudentWork.aspx file with no image displayed as I used in it actually.
I don't want that :(. I want my actual Error404.aspx page to be displayed.

Can u help me, where I'm going to be wrong......