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SOAP extensions provide a useful way to manipulate the data from an XML Web ser vice before it is mapped to a .NET object. SOAP extensions essentially allow you to extend the Web service and offer additional functionality outside of the actual Web method. Typically developers have used SOAP extensions to handle data encryption or to com press data to provide better performance. SOAP extensions are often used in conjunc tion with a custom SOAP header for user authentication. In this case, the user credentials are passed through the SOAP header. For more information about SOAP headers, refer to Lesson 2, How to Implement SOAP Headers.

Sara Morgan I recently did contract work for a company that was implementing an ASP.NET 2.0 application that was fed from Web services. The company was using the Microsoft Exception Handling Block to handle exceptions, but for unhandled exceptions, they wanted a way to trigger the exception logging inside the Web service itself. For regular ASP.NET applications you can handle unhandled

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A higher-than-desired value for any of these columns should lead you to look into the query s performance. Because SQL Server Profiler typically returns a lot of rows when used against a production server, you can consider letting SQL Server Profiler write the result to a file or table. Note that you can also start traces on the server without using the SQL Server Profiler graphical interface. SQL Server Profiler can be used to create the script necessary to start the trace on the server. To do so, just start the trace in SQL Server Profiler, and then, from the File menu, select Export, Script Trace Definition, For SQL Server 2005 2008. The server trace supports only tracing to a file. If you trace to a file, you can still query it from SQL Server by passing the name of the trace file as a parameter to the fn_trace_gettable table-valued UDF function.

Table 9-6

exceptions with some code in the global.asax file. But you cannot do this for Web services. So, the solution was to use a custom SOAP extension. For this solution, code was added to the AfterSerialize stage to check for unhan dled SOAP exceptions. If there were exceptions, then code was called to add the exception details to the SOAP message and handle the exception. The solution only worked when the unhandled exceptions were SOAP related, but for the cli ent, this was the only case they were concerned about. The solution was consid ered a success, and I thought it was a clever way to use SOAP extensions. The key to a SOAP extension is the capability to override the processing of the SOAP message on the Web server. Recall from Lesson 1 that the XML for a Web method is processed in a two-step process known as serialization and deserialization. On the Web server, there are four stages associated with these steps. Each of these stages is repeated twice once for the incoming SOAP message and once more for the outgoing SOAP message. The four stages that handle an incoming SOAP message from the cli ent are as follows:

Understanding how queries are logically constructed is important to knowing that they correctly return the intended result. Understanding how queries are logically constructed helps you understand what physical constructs (like indexes) help the query execute faster. Make sure you understand your metrics when you measure performance.

Occurs after serialization in which the data is serialized into XML, but before the XML is sent across the network. Occurs before the response is deserialized into an object.

Description Contains an informative message about the validation event. Describes the severity of the event, either Warning or Error. If the severity is Error, an exception will be thrown if this event is not handled.

The four stages that handle the SOAP message processing on the Web server are as follows:

In this practice, you test the query performance of three different versions of one particular query that produces the same result set. The query that you use should return all customers in a specific territory, as well as the last order received for those customers. If a customer does not have any orders, it should still be returned.

Occurs after the request is received, but before the message is deserialized into an object. Occurs after the message is deserialized into an object, but before the actual Web methods are called. Occurs after the Web method is invoked, but before the return values are serialized and sent back to the client.

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