Richard, you can use UserController.GetCurrentUserInfo() to retrieve information about logged on user. For example :

UserInfo uinfo = UserController.GetCurrentUserInfo();
// do whatever you want, for example to retrieve first name and lastname :

string username = uinfo.FirstName + " " + uinfo.LastName; // or you can use DisplayName

To retrieve it's role, you can use : uinfo.Roles(). it's an array, so you can enumerate using collection approach.

HTH.

Even more options (at least shorter);

//first option
        UserInfo usuari = this.UserInfo;
        Label1.Text = usuari.Username;
        

//second option
        Label1.Text = HttpContext.Current.User.Identity.Name;