global.asax - unable to get user identity

I'm trying to retrieve the user's AD name to set it into a session variable.  The line for retrieving the name is:

      string ADName;
      ADName = Page.User.Identity.Name.Substring(3);

This code works in my other pages, but I can't get it to work in my global.asax.  Visual Studio underlines "Page.User" with the following error message:

    An object reference is required for the nonstatic field, method, or property 'System.Web.UI.Page.User'

Any help is much appreciated.  If it's as simple as including a missing "using" statement, there's a part two to the does one find out which "using" statement is needed?

Who is Participating?
SteveGTRConnect With a Mentor Commented:
Do this:

string ADName;
ADName = Context.User.Identity.Name.Substring(3);

Good Luck,
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