ASP.net - Safe method to check session is null

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Robust application has to utilize Proper method to check the session veribles.Following  method is one of the best approch.

Assume  Session["selmachine_id"] hold string value

 string sessionMac = Session["selmachine_id"] as string;

                if (!string.IsNullOrEmpty(sessonTestId))
                {
                    //Valid Action
                 }


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