search database and display in datagrid view

Question

Please Help. I am developing an address book application.I have a textbox for search.But i dont need a button for search. When i type something in my text box,i want it to be searched in the database and display result in my datagrid view.What query should i usee? how can i get the result to my Datagrid view?Please Help.Any Help will be greatly appreciated.Thanks a lot for youur help.