ASP.NET

public ActionResult Create()
        {           
            string xx = (string)Session["usernameID"];
            int? currentPersonID = Convert.ToInt32(xx);

            string userNameComparedAgainstLoginName = // here is where i want to say 'name' of logged in user

            CreateModel model = new CreateModel();
            model.currentPersonID = currentPersonID.Value;
            model.PList4DD = db.People.ToList();   
           

            if (userNameComparedAgainstLoginName == model.userName)
            {
                ViewBag.Id = new SelectList(db.People, "Id", "Name");
                return View(model);
            }
            else
            {
                TempData["canOnlyBookHolidaysForYourself"] = "I'm afraid you can only book holidays for yourself";
                return RedirectToAction("Index");
            }
        }