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2. In the ToolStrip designer, add a ToolStripTextBox and a ToolStripButton to the new tool strip. 3. In the Properties window, set the Text property of the ToolStripButton to Search MSN and the DisplayStyle property to Text. 4. Double-click the tool strip button and add the following code to its event han dler:

SELECT * from Sales.SalesOrderDetailHistory WHERE Salesorderid = 43659;

In this lesson we look at how COM, COM+, MTS, Enterprise Services, and serviced components are all related. You gain an understanding of what a serviced component is, how to make one, and how to use the Enterprise Services such as transaction man agement, object pooling, and JIT activation.

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There are a couple of technologies that are interconnected when it comes to ser viced components: COM, COM+, Microsoft Transaction Server, and Enterprise Services. The Common Language Runtime (CLR) is the replacement for COM but not for COM+. COM+ is a run-time environment that provides a set of ser vices intended to make building scalable distributed systems easier. COM+ is the name given to Microsoft Transaction Server 2.0 (MTS 2.0). Both COM+ and MTS had poorly chosen names, which do not cover the underlying technology. This has been corrected. The .NET Framework introduces Enterprise Services, the next generation of COM+. Enterprise Services is a run-time environment that revolves around serviced components. To use the services offered by the Enterprise Services run-time environment, you need to create a serviced component. The serviced component provides access to Enterprise Services, and Enterprise Services give you access to services such as JIT activation, queuing, role-based security, object pooling, synchronization, and transactions. Using the classes in the System.EnterpriseServices namespace, Visual Studio enables you to easily create serviced components, and essentially create a class that you ll use to extend the ServicedComponent class. Let your class inherit from ServicedComponent and mark the class and its methods with attributes, providing metadata about how the component should be registered in the COM+ catalog. We ll see how all this works in Lesson 1. An assembly for a serviced component must be strongly named. A serviced com ponent can be consumed from a .NET assembly in the same way as you would consume a regular component: simply add an assembly reference to the dynamic link library (DLL) defining the serviced component.

SELECT * FROM MergeAudit;

WebBrowser1.Navigate("http://search.msn.com/results.aspx q=" & ToolStripTextBox1.Text)

12

In the existing query window, below the existing code, type, highlight, and execute the following command to undo the changes that you made:

Serviced components can also be made available as Web services by using the COM+ Simple Object Access Protocol (SOAP) service. Achieving this is merely a matter of applying the right attributes to your class. To be precise, use the SoapVRoot property of the serviced component s ApplicationActivation attribute. One of the most frequently used COM+ services is the Microsoft DTC. By enlist ing the .NET transaction in the DTC you can create transactions that run across multiple data sources and can even use a compensating resource manager (CRM) for resources that are not transactional by nature. You can for example, create a transaction that updates a record in the database, inserts a message in a message queue, and writes an entry to a file, all within the scope of one transac tion. The database and the message queue are both transactional, but the file sys tem is not. In this example a CRM would need to be created to reverse the changes made to the file in case the transaction needs to be rolled back. COM+ gives developers more control over their applications by allowing config urable transaction isolation levels. Versions of COM+ prior to COM+ 1.5 always used the highest level of isolation for transactions. Although this level guaran tees that data integrity is always preserved, it can lead to performance issues, such as timeouts, when many transactions need to be performed on a large data base. With configurable isolation levels, experienced developers can increase concurrency to improve performance and scalability. Serviced components are most powerful in a server-side environment and can be used to enhance both the functionality and performance of your .NET application.

// C#

After this lesson, you will be able to:

ROLLBACK TRANSACTION;

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