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When you start the debugging session, the Service help page is displayed in your Web browser (see Figure 1-3). It should display a link to the GetVendorList Web method. If you were to click this link, you would then be brought to the Service method help page for GetVendorList (see Figure 1-5). The Service method help page allows you to invoke a particular Web method. If the Web method accepts parameters, you would also be prompted to enter those values. Not only can you invoke the Web method and test your application, but you can also see sample request and response SOAP messages for this Web method. SOAP mes sages are discussed further in 2, Extending XML Web Services with SOAP Formatting, Headers, and Extensions. After you click Invoke on the Service method help page, the code for that Web method executes. If you set a breakpoint in your code using the Toggle Breakpoint (F9) com mand, the code stops executing at this point and allows you to step through the remaining code using the Step Over (F10), Step Into (F11), or Step Out (Shift + F11) commands. If the Web method executes successfully and returns a value, the next page you see should contain the results.

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To start the practice test software, follow these steps:

Figure 1-5

This lesson describes how to work with DataView objects (System.Data.DataView). DataView objects provide a way to work with DataTable objects and can be dis played in data-bindable controls such as a DataGridView. DataView objects provide sorting and filtering capabilities as well as the ability to modify the data in the related DataTable.

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In Lab 2, you created a Web method named GetVendorList. This Web method should return an XML string containing a list of active vendors from the AdventureWorks data base. The results should be displayed inside a new instance of your Web browser (refer to Figure 1-6). The GetVendorList Web method uses the FOR XML AUTO clause to automatically return a valid XML string directly from the database. If the Web method is unable to execute successfully and an exception is thrown, you should see a page displaying the exception encountered. It might be necessary to set a breakpoint using the Toggle Breakpoint function and step through the code until you are able to resolve the problem.

Click Start and select All Programs, Microsoft Press Training Kit Exam Prep. A window appears that shows all the Microsoft Press training kit exam prep suites that are installed on your computer. Double-click the practice test that you want to use.

The Introduction for this Training Kit contains information that you need to execute and test Web services created in the labs. Refer to these instructions if you are having trouble executing and test ing your Web service.

After this lesson, you will be able to:

When you start a practice test, you can choose whether to take the test in Certification Mode, Study Mode, or Custom Mode, which are as follows:

Figure 1-6

The second method for testing a Web service is to use your Web browser to access the Web service page (the one with the .asmx extension) directly. Web services built on your local development machine can be accessed using the name Localhost to specify the machine name. The remaining portion of the URL should be the name of the Web service project, followed by the name of the Web service page. For example, the Web service method created in Lab 2 can be accessed directly with the following URL: http://localhost:<portnumber>/MyWebService/MyWebService.asmx.

Resembles closely the experience of taking a certification exam. The test has a set number of questions, it is timed, and you cannot pause and restart the timer.

Create a DataView. Sort and filter data using a DataView. View data using a DataView. Search for data within a DataView. Navigate relationships using a DataView. Modify data using a DataView. Handle DataView events. Set default table views using a DataViewManager.

Visual Studio 2005 utilizes port numbers when debugging Web sites. The exact port number that is assigned is displayed in a balloon that appears above your task tray when you begin debugging. Write down this port number and you can use a Web browser to navigate to your Web service using the port number for your machine.

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