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I get error message at runtime “Value null was found where an instance of an object was required” when using Application state variables. why?

April 26, 2017application Error instance message null object runtime State value

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I get error message at runtime “Value null was found where an instance of an object was required” when using Application state variables. why?

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Application State variables must be initialized in C# before any operation is performed on them. For example.: You need to assign value to Counter state variable before performing the case (int)Session[“Counter”].