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Recall that in Chapter 25 we defined a WCF service contract that also manipulated two num-

bers via an addition operation, using the following service interface:

namespace MathServiceLibrary

{

[ServiceContract(Namespace = "www.intertech.com")]

public interface IBasicMath

{

[OperationContract]

int Add(int x, int y);

}

}

Also recall that this interface was implemented on a type named MathService and hosted by a

Windows service named MathWindowsServiceHost.exe. The Windows service exposed said function-

ality from the following endpoint:

http://localhost:8080/MathService

Assuming you created and installed this service (see Chapter 25 for details), you can update

your current WFMathClient project to communicate with it using the SendActivity type. The first

step is to add a reference to the service in the expected manner, using the Add Service Reference

dialog box (see Figure 26-20). This will generate a client-side proxy and update your App.config file

with WCF-specific settings. 

Figure 26-20.

Referencing the WCF MathService

Now, drag a SendActivity type onto your WF designer surface (named WCFSendAddActivity),

directly after the final Code activity. Using the Properties window, click the ellipsis button of the

ServiceOperationInfo property and from the resulting dialog box click Import. This will present you

with a secondary dialog box where you are able to associate a SendActivity type with a metadata

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