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We test this service by viewing it in the browser just as we did the previous service This is very easy to do because the DataSupplier service s only method requires no parameters That method returns a data set More correctly, it returns the SOAP message representation of a data set, which is identical to the XML persistence format that DataSetWriteXml produces Figure 636 shows the output of our test invocation of the GetNorthwindData method As you can tell from the size of the scroll bar thumb, it is a lot of bytes far more bytes than SQL Server s own format, which is used by the SqlClient classes and by the synchronization classes we encounter in 8 Figure 636 gives you insight into the two downsides of XML: It is verbose and it is not secure Actually, it is the transport that is not secure XML is no less secure than HTML, and most of us have allowed our credit card
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Figure 636: The SOAP Message Representation of a Data Set
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65 Web Services
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information to be transmitted via that protocol The key is to use a secure transport protocol, that is, HTTPS (Secure Sockets Layer) instead of HTTP HTTPS won t solve the verbosity problem, but it will address the security issue There are enormous upsides to Web services The platform independence they provide, the use of the Internet as the transmission mechanism, the adherence to developing standards, the presence of an independent standards committee, and the ease of client program development all make a strong case for using Web services, especially if the clients are requesting small amounts of data from within a secure networking environment
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653 A Web Services Client Application To illustrate the ease of developing Web services client programs in Visual Studio NET, we develop a client application for our two Web services The application consists of two forms, one for calling the Primes service and one for calling the DataSupplier service, as shown in Figures 637 and 638, respectively We open a new Smart Device application, add our two forms, and place the controls on them We are ready to start writing code But writing code works best when we have IntelliSense help, and that means having the class definitions available while we code The compiler also needs those definitions because it must perform type checking during
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Figure 637: Using the Primes Service
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Figure 638: Using the DataSupplier Service
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compilation The place to get those class definitions is from the WSDL that the asmx pages emit Just as the browser took full advantage of the WSDL to provide us with a test environment, Visual Studio NET uses the WSDL to provide us with a development environment Throughout this book, we have been getting class information by setting references to assemblies Now we will get our class information by setting our reference to the asmx page Either way, we are setting a reference to an object that provides interface definition information for a class In our Solution Explorer window, we right-click on References and then we select Add Reference from the context menu, receiving the dialog box shown in Figure 639 We enter the URL of our Web services page, as shown in the figure, and click the Add Reference button, producing a reference entry We want to rename the reference, which is a good practice in general Think of the reference name as though it were the namespace name of the Web services class because, when you write code, the reference name will be the namespace name That is, you create a new ReferenceNameClassName object to access the properties and methods of that Web services class In our example, we change the reference name to Primes, as shown in Figure 640 Then we repeat the process for the other Web services page located at the WSServer site, naming it DataSupplier This makes writing the code quite simple For our first form, the one that uses the Primes class, we create an instance of the Primes object and then invoke its GetFloorPrime method The input value is obtained from the text box, and the returned value is displayed in the label Listing 626 presents the code; Figure 630 shows the results
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