button.select

Question

hi,
I am having a 4 buttons and a textbox on a form in windows application. I am using button keypress event so that when I press on keyboard that appropriate button is triggered and button text should enter in to the text box. I gave focus to all 4 buttons and executed the application but when i press on keyboard, the keypress event is not raising, I also tried by giving select method to all buttons but the last button which I gave the select method is raising for all other buttons also. please help me..