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Session key invalid or no longer valid

Apr 3, 2009 at 3:24 PM
Hi,
I often get facebook.Utility.FacebookException: Session key invalid or no longer valid, but I know the user is logged on, and did log on not too long ago.
Is there a way to check if the session is valid, before trying to retrieve the data?
I use this example to build my method to determine if a user is connected : http://facebooktoolkit.codeplex.com/Thread/View.aspx?ThreadId=45825, which tells me the user is logged on, but I still get the session error?