public CalculatorDuplexClientBase(System.ServiceModel.InstanceContext callbackInstance) :
     base(callbackInstance, CalculatorDuplexClientBase.GetDefaultBinding(), CalculatorDuplexClientBase.GetDefaultEndpointAddress())
 {
     this.Endpoint.Name = EndpointConfiguration.NetTcpBinding_ICalculatorDuplex.ToString();
     ConfigureEndpoint(this.Endpoint, this.ClientCredentials);
 }