Check if Session has expired

How can I check if Session has expired?
Something like this (it is not working - I get Input string was not in correct format).
if (Session["UserId"]!=null)
{
}
johnson1Asked:
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Miguel OzSoftware EngineerCommented:
You could use the IsSessionExpired method described here.
This method relies on Session.IsNewSession  and a cookie to detect whether the session has expired or not.
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