set login status as 'offline' if progamm has been terminate

Question

Dear Sir,

I have a login table having column as 'Status' which is containing value "online" and offline.

and I set by default "Status=Offline".

When I have login  successfully then status is updated as "online". and on logout "Status=Offline" updated.

But when Application through an exception or terminated Then "Status=online" shown in login table.

so please tell me how to resolve this type of issue in C#