Do you get intellisence when you included the namespace in BizObject class? I mean when you write using System. and MB. then do you get intellisence? you should get intellisence here otherwise include references in your project to System.dll, .data, .web etc..
Do you have HttpContext, IDictionaryEnumerator, IPrincipal, BizObject ect. turned blue in your class? If they are blue then you should get intellisence.
Check if the intellisence window is checked on your visual studio setting.