Getting the textbox value from a dynamic datagrid and updating the corresponding Row

Question

Hi every one!

i've a dynamic datagrid with delete and and update functionalites,when the grid loads i'm binding the values to the textboxes on the same row i've update and delete buttons .

Now my problem is when if changes the textbox values and  click on update button , it should read the second and third column and update the corresponding row.

(delete is working fine,reading textbox values is the problem)

How can i achieve this plz help me out ,I'm badly stucked..