Returning a custom object in a WCF data contract

Dear Experts,

I was hoping somebody could help me with a problem I'm having with a WCF Service.

I'm trying to return a cusom object (defined elsewhere in my application) via my WCF service.

The object I'm trying to return is "UserExchangeCredentialSetCollection" which contains many "UserExchangeCredentialSet" items.

My Interface, (IExchangeService), has the following:

        [OperationBehavior]
        public UserExchangeCredentialSetCollection GetActiveExchangeUserCollection()
        {
            return UserExchangeCredentialSetMethods.GetActiveUserExchangeCredentialSetCollection();
        }

My service contract contains:

   [OperationContract]
        UserExchangeCredentialSetCollection GetActiveExchangeUserCollection();

Do I need to define this in my data contract?

If so, could somebody give me an idea of the best way to do this to enable me to use this data in my client application!

Many thanks in advance.

Nick

Current DataContract.cs (for testing only, with no mention of this collection)

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;

namespace LayerExchangeServices
{
    [DataContract]
    public class Request
    {
        string name;

        [DataMember]
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
    }

    [DataContract]
    public class Response
    {
        string message;

        [DataMember]
        public string Message
        {
            get { return message; }
            set { message = value; }
        }
    }
}

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