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One last thing to keep in mind is that just because a specification is absent from WSE does not mean that you cannot implement it yourself using custom code. The .NET Framework gives you support classes for working with XML, SOAP, and Web services, namely most of the core Web services technologies. In a sense, WSE provides you convenience, which is something you would rather have, but something that you can also live without if you have to. Developers already have a natural instinct to be self-motivated and to build custom solutions when nothing else is readily available. I am not advocating that you find your own way to implement something that should be standard. In the absence of a canned solution, you still have the tools to build a credible alternative solution yourself. However, be prepared for considerable complexity!

The CascadingDropDown control is ideal for situations when you need to have multiple drop-downs on a web page with the value(s) of each drop-down control being dependent on the selection from the previous one. In fact, you ve probably seen many sites taking advantage of this pattern. For instance, when you visit your printer or other computer accessories manufacturer site in search of the appropriate driver(s), you are often presented with a list of drop-down controls in order to find the right model. CascadingDropDown, much like the AutoCompleteExtender control, relies on web services to provide the necessary data. This allows for much flexibility in retrieving the data. You could, for instance, fetch the data from a database, serialized file, XML file, or some thirdparty source. Before jumping right into an example, Table 7-6 shows the properties of the CascadingDropDown control.

These include reliable messaging, transaction support, and authentication mechanisms to ensure that only trusted parties are involved in the service request (including certificatebased mechanisms) Services provide flexible binding: Services fully describe themselves using the WSDL contract This information includes documentation of the service operations as well as data type information, referenced by well-defined XML schemas This enables clear and unambiguous qualified references The best part is that a consumer does not have to have any prior knowledge of a data type, as long as its XML namespace is documented by or referenced by the WSDL contract For example, consider a consumer that calls a stock quote service This service provides a RequestQuote method that returns a custom complex data type called Quote, which includes current and previous share price information, as well as 52-week high and low values.

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CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)

In general, this book will remain focused on implementing solutions using the WSE support classes. But at times, I will show you ways to make up for deficiencies in WSE so that you can remain true to the spirit of the specification while using additional support technologies. As a .NET developer, you will find that the current version of WSE, along with a measure of creative thinking, will bring a heightened maturity to your Web services development efforts. WSE enables you to implement many of the features that a robust, business-oriented solution should include. Welcome to the dynamic, evolving world of service-oriented architecture with Web Services Enhancements!

The consumer has no advanced knowledge of how the Quote data type is structured, but it does not need to as long as it can reference the qualified associated XSD schema..

Category name of the CascadingDropDown control Status text shown on the control itself while the data for the drop-down is being fetched The ID of the other drop-down control whose selection impacts this control Text shown if the drop-down is empty Name of the web method used to retrieve the data Path of the web service used to retrieve the data ID of the target corresponding DropDown control

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