To Access the details from gridview all row single cell

Hi friends,
I have one gridview in which I bindinig data ,in gridview I have four BoundField  and one template field in template field I put Insert Item template which contains Textbox .
What is my requrement ?
at the submit button click I want access all Textbox value and store into Database.
If anybody has solutiuon then please share it ……..
Thanks