public ActionResult ChangeUsername(string newUserName, string password)
 {
     if (mDB.isUserExists((int)Session["id"], password) == true)
     {
         mDB.UpdateUsername((int)Session["id"], newUserName);
         Session["name"]  = newUserName;
         Session["error"] = "Sekmingai paskeistas vartotojo vardas";
     }
     else
     {
         Session["error"] = "Klaida pakeičiant vartotojo vardą";
     }
     return(RedirectToAction("Settings"));
 }