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This lesson shows you how to test and consume a Web service application. Testing a Web service involves invoking each of the public Web methods and verifying that the results returned are accurate. This testing can be done directly using a URL that points to the Web service file or by invoking the Web method using a separate client application.

After this lesson, you will be able to:

In the existing query window, type, highlight, and execute the following code to create an audit trigger:

Test a Web service method using a debugging session or directly with a URL. Consume a Web service method using a client application.

Answers to these questions and explanations of why each choice is correct or incorrect are located in the Answers section at the end of the book.

The Service help page (see Figure 1-3) contains links to all the public methods exposed with the WebMethod attribute. In Lab 2, only one Web method was created, so if you were to compile and test the application from this lab, only one link would be displayed on the Service help page.

CREATE TRIGGER tu_ProductAuditTrail ON Production.Product FOR UPDATE AS INSERT INTO Production.ProductAuditTrail (AuditDate, ChangeUser, ProductID, BeforeListPrice, AfterListPrice) SELECT GETDATE(), SUSER_SNAME(), i.ProductID, d.ListPrice, i.ListPrice FROM inserted i INNER JOIN deleted d ON i.ProductID = d.ProductID GO

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Figure 1-3 After executing the project created in Lab 1 and Lab 2, you should see this Service help page

1. How do you load the schema information from an .xsd file into a DataSet A. Call the GetXmlSchema method passing in the path to the .xsd file to the method. B. Call the ReadXml method passing in the path to the .xsd file to the method. C. Call the ReadXmlSchema method passing in the path to the .xsd file to the method. D. Set the DataSet s Name property to the .xsd filename. 2. How do you synchronize a DataSet with an XmlDataDocument A. By passing the XmlDataDocument to the DataSet.GetXml method B. By declaring a new instance of an XmlDataDocument and passing in the name of the DataSet you want to synchronize with C. By calling the XmlDataDocument.Load method D. By calling the XmlDataDocument.Synch method 3. How do you execute an XPath query on a DataSet A. Synchronize with an XML document and perform the XPath query on the raw XML. B. Pass the XPath query as a string to the DataTable.Select method. C. Pass the XPath query as a string to the DocumentElement.SelectNodes method of a synchronized XmlDataDocument. D. Pass the XPath query as a string to the DataTable.Find method.

In the existing query window, type, highlight, and execute the following code to test the audit trigger:

There are two methods you can use for testing your Web service. The first involves building your application and starting a debugging session so that you can step through the code of your application. This task is done by first selecting a start page for your application. For the application created in Lab 1, the start page would be the MyWebService.asmx file. You select the start page by right-clicking the file in Solution Explorer and clicking Set As Start Page. The next step is to initiate a debugging session by choosing Start Debugging on the Debug menu. Alternatively, you can press F5 to start debugging. The first time you initiate a debugging session for a Web project you ll see the dialog box shown in Figure 1-4. Click OK to start debugging.

Figure 1-4

SELECT * FROM Production.ProductAuditTrail GO UPDATE Production.Product SET ListPrice = ListPrice + 1 WHERE ProductID = 514 GO SELECT * FROM Production.ProductAuditTrail GO

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