Applying the Singleton Design Pattern in .NET Remoting
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by Joseph Chahine
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For many applications the Singleton Design Pattern approach works fine.  However, for multithreaded applications this approach proves to have a potentially hazardous side effect.  If two threads manage to enter the control block at the same time, two instances of the member variable could be created.  To solve this you might be tempted to merely place a critical section around the control block in order to guarantee thread safety.

However, ASP.NET runs each incoming request on its own separate worker thread.  The ASP.NET programming model is based on a scheme in which each worker thread is routed through a private set of ASP.NET objects, including applications, modules, pages, and custom handlers.  The ASP.NET programming model was designed to ensure that only one worker thread will ever touch any one of these objects at any one time.  This enhances productivity because you can write most of your ASP.NET code as single-threaded.  There is no need to worry about concurrency or thread safety for the scenario described in this article.

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