my dishwasher button is sticking .how much will it cost to fix ?

What make is the dishwasher? What model number is the dishwasher? What country do you live in? What part of that country do you live in? Do you have a local appliance repair centre or is the nearest one in another town miles away? How much do they charge per callout fee? How much do they charge for labour? The list goes on and on. Instead of talking about sucking air I suggest you pick up a phone and call your nearest appliance repairer, give them the details and ask them what it will likely cost. Someone on the internet, possibly in a different country from you can't possibly tell you how much it will cost in your particular case.

George
November 2012