private void SetValue(string seatRowPosition, TestPlanDummyViewModel newval)
 {
     if (_dictionary.Keys.Contains(seatRowPosition))
     {
         _dictionary[seatRowPosition] = newval;
     }
     else
     {
         _dictionary.Add(seatRowPosition, newval);
     }
 }
 private TestPlanDummyViewModel GetValue(string seatRowPosition)
 {
     if (!_dictionary.Keys.Contains(seatRowPosition))
     {
         var newval = new TestPlanDummyViewModel
         {
             SeatingPosition = seatRowPosition
         };
         _dictionary.Add(seatRowPosition, newval);
         return newval;
     }
     TestPlanDummyViewModel returnval;
     if (_dictionary.TryGetValue(seatRowPosition, out returnval))
     {
         return returnval;
     }
     return default(TestPlanDummyViewModel);
 }