Seriously...call an electrician! For an hour's diagnosis and possible resolution, you're eliminating further shock, potential fire, and/or early 'death' of the dishwasher. Your dishwasher is not grounded correctly, or the outlet that it's plugged into isn't. Either way, you are risking house and home. It doesn't matter if you've got guy help, girl help, or hermaphrodite help...get onsite help!
Take it easy Chef , had a bad day?

Electrician costs. I've just bought it from a friend upstairs, who had same type of appartment and never had this problem. This dishwasher doesn't need a special el. power connection, it can be connected as TV, PC or other things.
That's why I want to find out what could be a problem.
And thanks for your reply, I've got an idea why:
" Your dishwasher is not grounded correctly,
or the outlet that it's plugged into isn't."
I use a simple extension lead, probably that's why
I'll connect it to the main power outlet "in the wall", hope it will help
Just as appetite comes by eating, so work brings inspiration, if inspiration is not discernible at the beginning. (Igor Stravinsky)