Wcf service with SOAP request and response

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WCFServices

I have to create the web service to process SOAP message and response in SOAP format.
How to capture and process SOAP message in WCF and send the response to the client.

How to consume wcf service at client.

What I have tried:

[ServiceContract]
public interface IService1
{

    [OperationContract]
    string AddName(string XML);

    // TODO: Add your service operations here
}