problem with update query in c# .net

Question

Dear sir/Madam,
      This is vishnu vardhan,i got some error while update an field of a table which is connected by using oledb connection.
Table name is totallogins, contents are id(autonumber),token_no(text),user_id(number),from_date(date/time),to_date(date/time). my require output is at the time of login id,token_no,user_id,from_date  are filled and to_date column is fill when exit button clicks.In the attached query i got error msg as Data type mismatch.Could you please check and suggest us how to resolve my problem.
               THANKS IN ADVANCE.