How to values in DataGrid

I put a column of textbox in a DataGrid. When I postback the page, how can I retrieve the values in these textboxes?

 

Here's one way: http://www.tek-tips.com/viewthread.cfm?qid=975117&page=1

You can also cycle through the Cell control collection and for each TextBox, do your thing.

This is a helpful site: http://www.datagridgirl.com.
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I use FindControl to get value in textboxes. I have another question now.
For example, I got a value from a textbox, which is at column 1. How can I get which row that textbox is at?

 

At any time you should be able to call .SelectedIndex on the grid. You can also do processing when the selected item event fires.