Dropdown selection displaying "SYSTEM.RUNTIME.SERIALIZATION.EXTENSIONDATAOBJECT"

I'll take a look, but here is an edited version of the service interface that is being bound to the control:

namespace MyCompanyWinApp.CustomerSvc{ using System.Runtime.Serialization; using System; [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Runtime.Serialization", "3.0.0.0")] [System.Runtime.Serialization.DataContractAttribute(Namespace="http://schemas.datacontract.org/2004/07/")] [System.SerializableAttribute()] public partial class CustomerDC : object, System.Runtime.Serialization.IExtensibleDataObject { [System.NonSerializedAttribute()] private System.Runtime.Serialization.ExtensionDataObject extensionDataField; [System.Runtime.Serialization.OptionalFieldAttribute()] private int Customer_UIDField; [..] private string Full_NameField; public System.Runtime.Serialization.ExtensionDataObject ExtensionData { get { return this.extensionDataField; } set { this.extensionDataField = value; } } [System.Runtime.Serialization.DataMemberAttribute(EmitDefaultValue=false)] public int Customer_UID { get { return this.Customer_UIDField; } set { this.Customer_UIDField = value; } } […] [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")] [System.ServiceModel.ServiceContractAttribute(ConfigurationName="MyCompanyWinApp.CustomerSvc.ICustomerSC")] public interface ICustomerSC { [System.ServiceModel.OperationContractAttribute(Action="http://tempuri.org/ICustomerSC/GetCustomer", ReplyAction="http://tempuri.org/ICustomerSC/GetCustomerResponse")] System.ComponentModel.BindingList<MyCompanyWinApp.CustomerSvc.CustomerDC> GetCustomer(string filter); } [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")] public interface ICustomerSCChannel : MyCompanyWinApp.CustomerSvc.ICustomerSC, System.ServiceModel.IClientChannel { } [System.Diagnostics.DebuggerStepThroughAttribute()] [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")] public partial class CustomerSCClient : System.ServiceModel.ClientBase<MyCompanyWinApp.CustomerSvc.ICustomerSC>, MyCompanyWinApp.CustomerSvc.ICustomerSC { public CustomerSCClient() { } public CustomerSCClient(string endpointConfigurationName) : base(endpointConfigurationName) { } public CustomerSCClient(string endpointConfigurationName, string remoteAddress) : base(endpointConfigurationName, remoteAddress) { } public CustomerSCClient(string endpointConfigurationName, System.ServiceModel.EndpointAddress remoteAddress) : base(endpointConfigurationName, remoteAddress) { } public CustomerSCClient(System.ServiceModel.Channels.Binding binding, System.ServiceModel.EndpointAddress remoteAddress) : base(binding, remoteAddress) { } public System.ComponentModel.BindingList<MyCompanyWinApp.CustomerSvc.CustomerDC> GetCustomer(string filter) { return base.Channel.GetCustomer(filter); } }

}