Public Function EditingControlWantsInputKey(ByVal key As Keys, _
    ByVal dataGridViewWantsInputKey As Boolean) As Boolean _
    Implements IDataGridViewEditingControl.EditingControlWantsInputKey

    ' Let the DateTimePicker handle the keys listed.
    Select Case key And Keys.KeyCode
        Case Keys.Left, Keys.Up, Keys.Down, Keys.Right, _
            Keys.Home, Keys.End, Keys.PageDown, Keys.PageUp

            Return True

        Case Else
            Return Not dataGridViewWantsInputKey
    End Select

End Function

// Implements the IDataGridViewEditingControl.EditingControlWantsInputKey 
// method.
public bool EditingControlWantsInputKey(
    Keys key, bool dataGridViewWantsInputKey)
{
    // Let the DateTimePicker handle the keys listed.
    switch (key & Keys.KeyCode)
    {
        case Keys.Left:
        case Keys.Up:
        case Keys.Down:
        case Keys.Right:
        case Keys.Home:
        case Keys.End:
        case Keys.PageDown:
        case Keys.PageUp:
            return true;
        default:
            return !dataGridViewWantsInputKey;
    }
}