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// The key WCF namespace.

using System.ServiceModel;

namespace MagicEightBallServiceLib

{

public class MagicEightBallService

{

}

}

Our class type will implement a single WCF service contract represented by a strongly typed

CLR interface named IEightBall. As you most likely know, the Magic 8-Ball is a toy that allows you

to view one of a handful of fixed answers to a question you may ask. Our interface will define a sin-

gle method that allows the caller to pose a question to the Magic 8-Ball to obtain a random answer.

WCF service interfaces are adorned with the [ServiceContract] attribute, while each interface

member is decorated with the [OperationContract] attribute (more details regarding these two

attributes in just a moment). Here is the definition of the IEightBall interface:

[ServiceContract]

public interface IEightBall

{