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In typical ASP.NET 2.0 applications, if you do a postback on the web page, the entire page will be rerendered. This causes a blink or a flash in the client or browser. On the server, the postback is detected, which triggers the page life cycle. This ends up raising the specific postback event handler code for the control that caused the postback, and this calls upon the page s event handler. When you use UpdatePanel controls along with a ScriptManager control, you eliminate the need for a full-page refresh. The UpdatePanel control is similar to a ContentPanel control in that it marks out a region on the web page that will automatically be updated when the postback occurs (but without the aforementioned postback behavior on the client). It instead communicates through the XMLHttpRequest channel in true AJAX style. The page on the server still handles the postback as expected and executes, raising event handlers, and so on, but the final rendering of the page means that only the regions specified in the UpdatePanel control s regions are created. Also, unlike the ScriptManager, you can actually have multiple UpdatePanel controls on the same page and even have nested UpdatePanel controls within one another.

[WebMethod()] [SoapDocumentMethod(Use=SoapBindingUse.Literal, ParameterStyle=SoapParameterStyle.Bare)] public abstract Quote RequestQuote(string Symbol);

If you do not use bare encoding, then complex types may end up serialized as attributes, which may interfere with schema validation. This is known as wrapped encoding. Bare encoding looks like this:

To use an UpdatePanel control, you simply drag and drop it onto the design surface of your web form (see Figure 5-5).

The business component sets references to both the service agent assembly and the definition assembly of custom types. Listing 4-10 shows how the business component calls the service agent. Listing 4-10. The StockTrader Business Component Calling the Service Agent using System; using StockTraderTypes; using StockTraderServiceAgent; namespace StockTraderBusiness { public class StockTraderBusiness : StockTraderTypes.IStockTrader { public StockTraderBusiness() {} public Quote RequestQuote(string Symbol) { // Create a new Quote object Quote q = new Quote(); // Call the service agent StockTraderServiceAgent sa = new StockTraderServiceAgent(); q = sa.RequestQuote(Symbol);

While wrapped encoding looks like this:

However, as you know, the UpdatePanel control cannot function without a ScriptManager control on the page. Additionally, the ScriptManager control must be located before any UpdatePanel controls on your page. In other words, as you read your source code from top to bottom, the ScriptManager reference should appear before the UpdatePanel ones. Using the Tasks Assistant will ensure that it is placed correctly. If your ScriptManager control is not present or is incorrectly placed, you ll get an error when you try to open the page in a browser (see Figure 5-6).

return q; } } } As you would expect, the listing is very simple because the business assembly no longer has to provide its own implementation of the Quote request logic. In summary, service agents are an elegant solution when you need to interface with one or more external services and wish to isolate the code that handles the communication. Service agents provide stability to a business assembly by bearing the responsibility of ensuring successful calls to external services and returning results in a form that the business assembly natively understands. Service agents can also act as intermediaries between two or more Web services. This concludes the discussion of how to build basic service-oriented Web services.

Wrapped encoding will generate fewer XML characters and a smaller SOAP payload, but it may create big problems if custom types cannot be validated against their XSD schema files. Table 3-1 summarizes important properties of the serialization attribute, including how certain property values influence the processing behavior of a Web service.

The UpdatePanel control contains a designer surface where you can place HTML. This markup is the only one updated upon a postback if the ScriptManager control is enabled for partial updates. Consider Figure 5-7, where several text boxes and a button appear on the screen. This application has two text boxes, two labels, and a button outside the UpdatePanel control, and it has a label inside the UpdatePanel designer. The label on the inside is called lblResult. The code behind the button reads as follows:

NOTE Reflection attributes allow you to add additional metadata to a wide variety of code elements including classes and methods. Attributes modify the way that the element is processed. For example, the [WebMethod] attribute designates a standard method or function as capable of accepting serialized XML messages. Of course, reflection attributes must have meaning to the processing code in order to be applied. Reflection attributes may include properties that provide additional metadata information. For more on reflection attributes, consult the MSDN online article on attributes, located at MSDN Home MSDN Library .NET Development Visual Studio .NET Visual Basic and Visual C# Reference Visual C# Language C# Language Specification.

Summary

int x = Convert.ToInt16(txt1.Text); int y = Convert.ToInt16(txt2.Text); int z = x+y; lblResult.Text = z.ToString();

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