Answer Posted / guest

Here, bind primary key of database to datagrid column make
it visible false.
and travel loop as

foreach(DataGridItem dataItem in DataGrid1.Items)
{
priceText = (TextBox)dataItem.FindControl
("txtBookPrice");
bookIdText = (TextBox)dataItem.FindControl("txtBookId");

Updatecode_for_perticular_row ();

}

txtBookPrice= textbox from witch u would like to update
txtBookId= test i.e. unique id comming from database

With help of unique id in for loop find perticular text in
texbox and update.

This code you will write on update button click.

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