>Keeping the thread, I have some problem.
>Some users disconectting from they network drive by mistake or other reason, this bring like consequence that the system get error.
>How I fix this situation.?
>If I used a timer control, suppose that I have to check out if the network drive and letter is online.
>What do you think I shuold do.?

Relying on drive mapping where the user can, and does, alter it on a whim, is a serious problem. The best solution is to use UNC references, which specify the file's location based on the consistent address published to the network rather than a drivemapping which can be altered, andmay not be assigned consistently at all stations, so that the name remains the same regardless of other actions on the station.