protected void ToString(List <string> toStringOutput)
 {
     toStringOutput.Add($"StateFilter = {(StateFilter == null ? "null" : StateFilter.ToString())}");
     toStringOutput.Add($"DateTimeFilter = {(DateTimeFilter == null ? "null" : DateTimeFilter.ToString())}");
     toStringOutput.Add($"FulfillmentFilter = {(FulfillmentFilter == null ? "null" : FulfillmentFilter.ToString())}");
     toStringOutput.Add($"SourceFilter = {(SourceFilter == null ? "null" : SourceFilter.ToString())}");
     toStringOutput.Add($"CustomerFilter = {(CustomerFilter == null ? "null" : CustomerFilter.ToString())}");
 }