private void PopulateNotFriends()
 {
     IDAL DAL = new DBDataAL();
     IEnumerable<string> friends = DAL.GetFriends(Owner);
     IEnumerable<string> users = DAL.GetAllUsernames();
     NotFriends = users.Where(x => x != Owner.UserName).Where(x => !friends.Contains(x)).ToList();
 }