gridview auto suggestin through database when i write text in textbox without taking button

Question

i want to create program like when i write in the textbox some text or string the gridview automatically display the related data which is available in the database

i have created program but when i input some string like 'p' then i have to press tab button to get data and its displays also but i want to do automatic filter when user write something its display the related data into the gridview