in my form i am using repeater in that repeater haveing datagrid i assening some modifications in repeter by firing the item data bound and also in the datagrid event itemdatabound will also want to fire but it is not working, please give anybody ans bjayakumar hyd

i have a form in that if my curser is there in textbox then i pree backspace then the form will go back page, but my focus will be ther in the form then my backspace is want to disable please tell me ans, it's argent bjayakumar hyd india