The goal was to let users check off the radio buttons without having to put the row in edit mode.
The Data Grid was driven by a Data Table in a Data Set that held all the rows for the survey, along with the current user's response.
The functional requirement is to fetch the list of students (3 coloums) from database (SQL Server) and display it on the web page, along with a blank field in front of each row for entering data.
Next, to allow the user to enter marks scored by students in the test and update those in the database.
I poked around the net and all the samples i see are similar to what is in the link you provided.