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the session state. This holds true also if you or your code modify the timestamp of those files or alter the contents of one of the special folders, such as Bin or App_Code. Note What happens to the session state when a running page hits an error Will the current

Figure 30-8 The .NET component displayed in the OleView utility. All .NET components exposed to COM can be found in the .NET category subtree.

dictionary be saved, or is it just lost The state of the session is not saved if, at the end of the request, the page results in an error that is, the GetLastError method of the Server object returns an exception. However, if in your exception handler you reset the error state by calling Server. ClearError, the values of the session are saved regularly as if no error ever occurred.

The session state loss problem that I mentioned earlier for InProc mode can be neatly solved by employing either of the two predefined out-of-process state providers: StateServer or SQLServer. In this case, though, the session state is held outside the ASP.NET worker process and an extra layer of code is needed to serialize and deserialize it to and from the actual storage medium. This operation takes place whenever a request is processed. The need to copy session data from an external repository into the local session dictionary might tax the state management process to the point of causing a 15 percent to 25 percent decrease in performance. Note, though, that this is only a rough estimate, and it s closer to the minimum impact rather than to the maximum impact. The estimate, in fact, does not fully consider the complexity of the types actually saved into the session state. Note When you get to choose an out-of-process state provider (for example, StateServer and

The other option is /regfile, which doesn t register the component but creates a .reg file that you can later use to create all the necessary registry keys. (You can t use this option with /u or /tlb, and you can t duplicate its effect from inside Visual Studio.)

SQLServer), be aware that you need to set up the runtime environment before putting the application in production. This means either starting a Windows service for StateServer or configuring a database for SQLServer. No preliminary work is needed if you stay with the default, in-process option.

The .NET SDK offers another tool that you can use to export a type library, the Type Library Exporter utility (TlbExp). TlbExp has the same effect as using the /tlb option with RegAsm, except the component isn t registered:

When you use the InProc mode, objects are stored in the session state as live instances of classes. No real serialization and deserialization ever takes place, meaning that you can actually store in Session whatever objects (including COM objects) you have created and access them with no significant overhead. The situation is less favorable if you opt for an out-of-process state provider. In an out-of-process architecture, session values are copied from the native storage medium into the memory of the AppDomain that processes the request. A serialization/deserialization layer is needed to accomplish the task and represents one of the major costs for out-of-process state providers. How does this affect your code First, you should make sure

If you omit the /out option, TlbExp creates a type library with the same name as the source DLL but with a .tlb extension. In practice, you ll use TlbExp far less frequently than RegAsm.

It results in the following HTML code:

You can omit DocMap, Parameters, or Toolbar if you want to display these items. The default value for these parameters is True, and you do not need to explicitly include them in the URL request.