How to place a required field validator inside a GridView TextBox

Question

I have a GridView with some TemplateField items containing TextBox controls. I would like to add a required field validator on it. This is

Answer 1

Within gridview i assign textbox,requiredfieldvalidator and button,This validator validate all textboxes in gridview when button click without filling textbox. How can i solve this..

This will validate all textboxs in gridview,When i click button in particular row without filling the textbox in itemtemplate.