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From Session_Start I call: MyFunction (this) that detects the type of system in use. Upon receiving this in the function, I look in the debug and indicate that "this" is type "dynamic {ASP.global_asax}". If I enter "this is ASP.global_asax" answer true. But it does not allow me to write this same line in code.

1.- How can I detect the type ASP.global_asax
2.- What is the correct way to detect the Aspx system. I now use System.Web.HttpContext.Current! = Null

Well, the keyword "this" in Session_Start refers to the Global_asax class since Session_Start is a member of the Global_asax class.  The same holds true for any class in the .NET framework.  

Can you explain the problem you are string to solve?