public bool AddEntry(SupplyOrderEntry entry)
 {
     foreach (var testEntry in OrderEntries)
     {
         if (entry.ItemName == testEntry.ItemName)
         {
             return(false);
         }
     }
     OrderEntries.Add(entry);
     return(true);
 }
 public void RemoveEntry(SupplyOrderEntry entry)
 {
     OrderEntries.Remove(entry);
 }