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.NET Web services allow you to expose data to outside consumers as Extensible Markup Language (XML). Web methods of those Web services behave virtually identically to how normal methods behave. .NET Web services can be created and consumed in any .NET language. .NET Web services can be consumed by anything that can parse XML, which is how the data is returned. A Web reference is needed to consume a Web service. After a Web reference is added to a project, Visual Studio 2005 creates a class that maps to the Web service s methods and properties, which allows you to interact with the Web service as though it were local. Web methods can be called just like traditional methods. Invocations can be done either asynchronously or synchronously. To implement fire and forget functionality, you can use the OneWay attribute on Web methods. The two methods you can use to determine when a Web method has finished executing are polling and callbacks. Semantically, callbacks are much more elegant than polling.

Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.

Review the result set and notice that full-text indexing has been enabled on the ProductReview, Document, and JobCandidate tables.

In the following case scenarios you apply what you ve learned about how to use Web methods and Web services. You can find answers to these questions in the Answers section at the end of this book.

System.Threading.Thread.Sleep(1000);

Extending Microsoft SQL Server Functionality with the Spatial, Full-Text Search, and Service Broker

Many companies expand operation over time and need much of their functionality exposed to external customers. .NET Web services and .NET remoting are two of the primary vehicles that make this available. The following case study concerns itself with developing a Web services strategy.

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Following is a list of company personnel interviewed and their statements:

If you run the samples from the text, a full-text index also exists on the ProductDescription table.

3. Add a delegate to the application that is appropriate for TimeConsumingMethod, as shown below:

This company has been around for awhile and the original IT infrastructure was comprised of many different vendors proprietary prod ucts. This legacy has been one of the biggest obstacles we ve faced in moderniz ing operations. None of the systems talk to each other and that causes a lot of manual data entry, not to mention data entry errors. We ve consolidated a lot of this information into a SQL Server database, but a few of our products still run on OleDb databases. We need to expose this functionality to our trading part ners and customers so they can see real-time data and enter data as well. We started trying to use Java to fix these problems, but the solution was riddled with

problems. We needed this fixed last year and would love to move to the .NET Framework, but only if it can help us with this problem.

4. 5.

' VB Private Delegate Sub TimeConsumingMethodDelegate(ByVal j As Integer) // C# private delegate void TimeConsumingMethodDelegate(int seconds);

Because we have a lot of shortcomings with real-time sys tems, we end up having to do a lot of extra things, which typically involve giving stuff away or selling it at a discount, not to mention having to keep a lot of extra data entry personnel on staff. This is a problem but we can live with it. However, we can t live with customers leaving our company because other companies have real-time tracking and transmission information available to them. And a reason this is happening is because other companies have updated their pro curement and delivery systems with their trading partners so a lot can be done without manual intervention. Without a doubt, this is the most pressing issue we face and it needs to be addressed as soon as possible. We re still stuck in the 90s in many respects; heck, we re in the 80s in a few respects. This situation needs to be fixed. We tried a huge Java initiative a while back, but it was nothing but problems. Most developers in the area didn t know it so we had to hire a bunch of really expensive consultants. A few issues were fixed but it ran slow and nothing was accomplished in exposing our sys tems externally. To be honest, external exposure was the only reason I was will ing to sink the resources into trying it in the first place and I lost my shirt on this. I ve got one last chance to fix this but I ll be gambling everything on it. Yes, I m skeptical, very skeptical in some respects, that fixing it is even possible. Well, I know it can be, but not without causing downtime and so many problems that it isn t viable.

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