public void AssignWindfall(WindfallEntry windfall)
 {
     if (windfall != null)
       {
     _windfall = windfall;
       }
 }
        public void UpdateWindfall(WindfallEntry item)
        {
            WindfallEntry oldItem = null;

              foreach (var entry in _windfallEntries)
              {
            if (entry.Id == item.Id)
            {
              oldItem = entry;
            }
              }

              if (oldItem != null)
              {
            _windfallEntries.Remove(oldItem);
              }

              _windfallEntries.Add(item);
        }