Adding TextBox in GridView

I am using GridView in Asp.net Visual Studio Express edition.

How to add textbox for every row in gridview.

I am working on shopping cart in Asp.net and i have to add textbox to all rows displayed.

Also tell me how to add checkbox control such that users can check the desired rows.

The checkbox control in gridview displays only the values in database.If we want to add seperately not involving database.?How to add?

 

Willfin David.