Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

'Check box column index
Private CheckColIndex As Integer = 0
Private Sub DataGridView3_CellValueChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView3.CellValueChanged
    'Check the column index and if the check box is checked.
    If e.ColumnIndex = CheckColIndex Then
        Dim isChecked As Boolean = CType(Me.DataGridView3(e.ColumnIndex, e.RowIndex).Value, Boolean)
        If isChecked Then
            'If check box is checked, uncheck all the rows, the current row would be checked later.
            For Each row As DataGridViewRow In Me.DataGridView3.Rows
                row.Cells(e.ColumnIndex).Value = False
            Next
        End If
    End If
End Sub