i want compare text box values in gridview with the database

i have one gridview that gridview is bind dynamically in that grid each rews have text box if i enter the values in text box that values  compare with the database table 
suppose i enter the in first textbox 12 but  in database table that values is 10 then that value is not accept 
but my grid colomn is create dynamiclly means i select A division then the colomn is 3 subject but i select the B division then colomn is 4 subject