how to use class instance in asp.net

hi ,
i posted a related question already but i dint get any reply so ia m rephrasing the question.

I have a Class and i want to be able to use its instance
example
public class Enrolltest : System.Web.UI.Page
{
MyClass mc = new MyClass();

mc.mymethod();

}

when i do this i get an error telling me there is no name space what should i do .,,.
i dont want to create a dll and add it to assembly and all that stuff.
is it possible at all. Am i misisng somthing.
thanks.

I think you need to create a solution with classes

You need to include the namespace for System.Web.UI.Page. Lookup the "Inherits" command.
-Dave