How we can change color of gridview record

Question

ASSALAM-0-ALIKUM TO EVERYONE;

HOW WE CAN CHANGE COLOR OF RECORD WHEN I PRESS FIND BUTTON. ACTUALLY I WAS SEARCHING A DESIRE RECORD AND I AM GETTING ALL INFORMATION OF DESIRE "DOCUMENT ID" IN TEXTBOXSES. BUT NOW, I WANT TO ENTER DESIRE DOCUMENT ID AND I WANT TO SHOW MY COMPLETE RECORD OF DESIRE DOCUMENT ID IN GRIDVIEW WITH CHANGE COLOR. BUT REMEMBER, IF I PRESS FIND BUTTON THEN DO THIS TASK. I AM SHOWING MY SCREEN SHOT AND PREVIOUS CODE OF FIND BUTTON.

REGARDS
SUMAIRA MANZOOR