from:(http://msdn.microsoft.com/en-us/library/ff647180.aspx)

Step 7: Create a Test Client Application

In this step, you create a Windows Forms application named Test Client to test the WCF service.

1. Right-click your solution, click Add, and then click New Project.
2. In the Add New Project dialog box, in the Templates section, select Windows Forms Application.
3. In the Name field, type Test Client and then click OK to create a Windows Forms application.
4. Right-click your client project and then click Add Service Reference.
5. In the Add Service Reference dialog box, set the Service URI: to net.tcp://localhost:8523/WCFTestService and then click Go.
6. Change the Service reference name: to WCFTestService and then click OK.

Step 8: Test the Client and WCF Service

In this step, you use the test client to ensure that the WCF service is running properly.

1. In your client project, drag a button control onto your form.
2. Double-click the button control to show the underlying code.
3. In the code behind the button click, create an instance of the proxy, and call the DoWork() method of your WCF service.

   When you call the service, your current user security context will automatically be passed to your WCF service. The code should look as follows:

   private void button1_Click(object sender, EventArgs e)
   {
         WCFTestService.MyServiceClient myService = 
            new WCFTestService.MyServiceClient();
         MessageBox.Show(myService.DoWork("Hello World!"));
         myService.Close();
   }
   
   

4. Right click the client project and then click Set as Startup Project.
5. Run the client application by pressing F5 or CTRL+F5.

   When you click the button on the form, the message “Welcome Hello World!” should appear.

Host your WCF service with multiple host environment using multiple protocol