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If I have an object stored in memory, and I walk away from my application for an hour, will the object still be there when I get back?
In other words, will the .NET garbage collector throw my object away because it hasn’t been used for awhile?
The garbage collector only collects objects that are no longer referenced in your application. The garbage collector will never collect any objects that are being used.
The garbage collector’s definition of “being used” is based on roots. An object instance has roots if other object instances in the AppDomain reference it. As long as the AppDomain that hosts your application is not unloaded, any and all object instances that were in memory will remain in memory as long as they retain roots in the application.