Question

I need to put a Checkbox against each Row in a DataGridView. I am making use of DataGridViewCheckBoxColumn for the purpose. But here user is able to select more than 1 row. How to restrict the user from selecting multiple rows in a DataGridView?

Answer 1

You will have to do it yourself when the checkbox is checked.

If you want to respond immediately
when users click a check box cell, you
can handle the
DataGridView.CellContentClick event,
but this event occurs before the cell
value is updated. If you need the new
value at the time of the click, one
option is to calculate what the
expected value will be based on the
current value. Another approach is to
commit the change immediately, and
handle the
DataGridView.CellValueChanged event to
respond to it. To commit the change
when the cell is clicked, you must
handle the
DataGridView.CurrentCellDirtyStateChanged
event. In the handler, if the current
cell is a check box cell, call the
DataGridView.CommitEdit method and
pass in the Commit value.

Whichever method you use, when you handle the checkbox being checked, you will need to mark all the other checkboxes as unchecked. How you will do that depends on whether (and how) your DataGridView is data-bound.