We’ll not discover another Americas, but this is easy:

With the Razor Engine, put this on View:

@{
string luser = User.Identity.Name.Split('\\')[1];
}

You're logged in as @luser

Or use this on Controller:

string luser = User.Identity.Name.Split('\\')[1];

Remember that you must use the Windows Authentication, in other cases, you’ll get an empty string.