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Add Reference
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If you are using an assembly containing .NET managed classes in your application, and that assembly is not delivered as a part of the core .NET Framework that ASP.NET prereferences, you can create a reference to the assembly with Add Reference. Doing so will add the classes within the assembly to the IDE for IntelliSense, as well as create a copy of the DLL for the assembly in the Bin folder. Selecting Add Reference will open the Add Reference dialog box (see Figure 2-12).
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CHAPTER 2 s BASICS OF WEB DEVELOPMENT WITH ASP.NET
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Figure 2-12. Adding a reference
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One option is to add a .NET assembly from the .NET tab in the Add Reference dialog box, in which case the process is straightforward. Just make sure that you deploy the DLL containing the assembly with your site, and your application should work well. Another option is to add a COM component from the COM tab, which is a little more complex. As I mentioned previously, you ll have to make sure that the COM component is properly installed on the server as well as the COM interop assemblies that are generated by the IDE to enable your code to interact with the COM component from the .NET runtime environment. If the component that you need isn t on the list, whether it s a .NET assembly or a COM component, you can look for it on the Browse tab, or the Recent tab, where, for your convenience, recently added components are listed. So, for example, if you want to use the Microsoft AJAX Extensions for ASP.NET (formerly known as Atlas in its beta form), discussed in s 11 through 14, you can use the Browse tab to go to their installation directory and pick them up from there (see Figure 2-13). (Note that you can select multiple files on this tab.) Once you locate the files using the Browse tab, you will be able to use the controls and functions from these DLLs in your web site.
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ASP.NET AJAX: THE WHATS, WHYS, AND WHERES
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Ajax is a technology that allows you to break through many of the typical restrictions of browser-based applications. While the acronym AJAX stands for Asynchronous JavaScript and XML, it has become synonymous with dynamic, flexible applications built on the asynchronous functionality that is provided with the XMLHttpRequest object and the styling innovations from CSS (Cascading Style Sheets). ASP.NET AJAX is a technology that is designed to make Ajax applications much easier to develop, debug, and deploy. It s available at http://asp.net/ajax/, and will be covered in s 11 through 14 of this book.
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Figure 2-13. Adding a reference to the AJAX assemblies
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A web service has an associated definition file called a WSDL (pronounced WIZ-dull). You can point the Visual Studio IDE at the WSDL for a web service, and the IDE will automatically create all the code necessary for talking to the web service by using the standard SOAP code that web services use. So, for example, if you want to talk to a web service that is hosted at the following URL
http://www.swanandmokashi.com/HomePage/WebServices/StockQuotes.asmx WSDL
you simply need to enter this into the URL field in the Add Web Reference dialog, as shown in Figure 2-14.
CHAPTER 2 s BASICS OF WEB DEVELOPMENT WITH ASP.NET
Figure 2-14. Creating a web reference
Visual Studio will then create a special type of class called a proxy. This is simply a local representation of the remote service, allowing you to call methods as if they were implemented on your local computer. However, under the covers, ASP.NET will forward all of the proxy method calls to the remote service for execution. If Visual Studio interprets the file successfully, you will see a list of available methods (GetStockQuotes in the example in Figure 2-14). You can then create a name for the web reference and add the reference to your project. At this point in your project, you can create an instance of the web reference proxy class and call the method on it to get data back from the web service. In fact, let s do that now so that we can call a remote web service to obtain stock quotes for our example. Right-click the project name and select Add Web Reference. When the Add Web Reference dialog box appears, type http://services.xmethods.net/ soap/urn:xmethods-delayed-quotes.wsdl into the URL field and click Go. We ll be using a service provided by XMethods (www.xmethods.com) that reports delayed stock quotes given a stock ticker symbol. You can see this in Figure 2-14. After clicking Go, Visual Studio contacts XMethods, downloads the WSDL, and displays the available methods it finds for you to review. Note the value in the Web reference name field (net.xmethods.services), which will ultimately form the namespace of the proxy class you ll be using. Change the value you find there to QS for quote service, and then click Add Reference. At this point,
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