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By Derek Beyer

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As you see later in this chapter, this attribute is read from the metadata and applied to the component when it is installed into a COM+ application. Just In Time Activation I state previously that the logical transaction starts when the caller makes its first method call on a transactional component. The logical transaction starts when the component is created. Both statements are true due to a concept called Just In Time Activation (JITA). JITA can be either enabled or disabled for a component.

Part II: COM+ Core Services Chapter List Chapter 4: Transactions Chapter 5: Security Chapter 6: Events Chapter 7: Object Pooling Chapter 8: Queued Components Chapter 4: Transactions In This Chapter • • • • ACID requirements Logical transaction lifecycle Physical transaction lifecycle Writing transactional components in C# Transactions are one of the cornerstone services of COM+. In fact, the benefits COM+ transactions provide applications are among the most driving factors in developers' decisions to use COM+.

The ServicedComponent class exists in the System namespace. To get access to this namespace from your code, implement a using System statement within your code. Normally, you must make a reference to an assembly containing the namespace you wish to use. The C# compiler is kind enough to include a reference for each component or application automatically because the System namespace is so frequently used. NET uses namespaces to organize classes, interfaces, methods, and so on that implement similar or complementary functionality.

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