There are a few gotchas with checking the value of a CheckBox in a DataGridView. You can use the CellValueChanged event, the bound object will have been updated so its easy to check…
Private Sub PaymentsDataGridView_CellValueChanged(ByVal sender As System.Object, _
ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) _
Handles PaymentsDataGridView.CellValueChanged
'This code will be called while loading the grid as well so I
'just check for it by setting a flag
If Not _Loading AndAlso e.ColumnIndex = 4 AndAlso e.RowIndex >= 0 Then
Dim aSummary As RebatePatientSummary = _
DirectCast(PaymentsDataGridView.Rows(e.RowIndex).DataBoundItem, _
RebatePatientSummary)
If aSummary.PrintMe Then
_PrintCount += 1
Else
_PrintCount -= 1
End If
AvailableToPrintLabel.Text = "Selected for printing : " & _PrintCount
End If
End Sub
That gotcha here though is that the event is only fired once the cell has lost focus!
You can use the CurrentCellDirtyStateChanged but that only fires once so if the user clicks the checkbox multiple times you don’t actually know the final state
