I have done this before but I can't remember how you make columns read only.
For example, my datagrid looks like this:
Name ID Time In Time Out
joe 4 10:00 AM 11:00 PM
jane 5 9:30 AM 12:00 PM
When I go to the edit mode, I don't want the user to be able to edit the Name column or the ID column. Thanks in advance