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Generation QR Code in Visual C# Why Does My Session State Sometimes Get Lost

Why Does My Session State Sometimes Get Lost
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Values parked in a Session object are removed from memory either programmatically by the code or by the system when the session times out or it is abandoned. In some cases, though, even when nothing of the kind seemingly happens, the session state gets lost. Is there a reason for this apparently weird behavior When the working mode is InProc, the session state is mapped in the memory space of the AppDomain in which the page request is being served. In light of this, the session state is subject to process recycling and AppDomain restarts. The ASP.NET worker process is periodically restarted to maintain an average good performance; when this happens, the session state is lost. Process recycling depends on the percentage of memory consumption and maybe the number of requests served. Although it s cyclic, no general estimate can be made regarding the interval of the cycle. Be aware of this when designing your sessionbased, in-process application. As a general rule, bear in mind that the session state might not be there when you try to access it. Use exception handling or recovery techniques as appropriate for your application. Consider that some antivirus software might be marking the web.config or global.asax file as modified, thus causing a new application to be started and subsequently causing the loss of
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17 ASP.NET State Management
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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
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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.
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Persist Session Data to Remote Servers
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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
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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.
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State Serialization and Deserialization
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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
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