C# Class Library - Singleton Design Pattern?

It will be persisted through multiple calls, but there is one caveat. The static variables are scoped to the AppDomain, so any time the IIS worker process is recycled, any data stored in a static variable will be lost. The same is true of session data, if you're storing it "in proc.

Because the singleton is static, your data will be available for all the requests in your web application, so it will not be available only for the session.

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