FULL ERROR

Exception: System.ServiceModel.CommunicationException: There was an error while trying to serialize parameter http://tempuri.org/:ExportValuationPolicyNumberResult. The InnerException message was ‘Type ‘TFBIC.RCT.WCFWebServices.ExpressLync.MainStreetValuation’ with data contract name ‘MainStreetValuation:http://schemas.datacontract.org/2004/07/TFBIC.RCT.WCFWebServices.ExpressLync’ is not expected. Add any types not known statically to the list of known types – for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.’. Please see InnerException for more details. —> System.Runtime.Serialization.SerializationException: Type ‘TFBIC.RCT.WCFWebServices.ExpressLync.MainStreetValuation’ with data contract name ‘MainStreetValuation:http://schemas.datacontract.org/2004/07/TFBIC.RCT.WCFWebServices.ExpressLync’ is not expected. Add any types not known statically to the list of known types – for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.

SOLUTION

1. Manually create a proxy to the WCF Service from the command line like so:
svcutil /serializer:XmlSerializer http://localhost:46122/ValuationService.svc

2. Add the [XmlSerializerFormat] to your ServiceContract on the WCF Service

By doing this, we force our WCF Service to use the XmlSerializer rather than the default DataContractSerializer. Note: you?ll need to call the WCF service from you new proxy in your sample code.