Linq Error: ... no supported translation to SQL

I am new with Linq to Sql.
I don't want to use "for each next",
because I am returning one record.
I tried,
Dim db As New Ticket_JCDataContext
                Dim ThisTicket = (From t In db.tblTickets Where t.ID = ViewState("strTicketID")).First

I got an error:
Method 'System.Object CompareObjectEqual(System.Object, System.Object, Boolean)' has no supported translation to SQL

How can I make it work?

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