Visual Basic

If e.DesiredType.Equals(GetType(MySql.Data.Types.MySqlDateTime)) Then
            If String.IsNullOrEmpty(e.Value) Then
                e.Value = DBNull.Value
            Else
                Try
                    e.Value = New MySql.Data.Types.MySqlDateTime(DateTime.Parse(e.Value))
                Catch
                    e.Value = DBNull.Value
                End Try
            End If
            e.ParsingApplied = True
        End If

Private Sub DataGridCusto_CellParsing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellParsingEventArgs) Handles DataGridCusto.CellParsing

private Panel panel;
private bool paintRectFlag=true;
private Rectangle rect=new Rectangle(20, 20, 300, 200);
private Pen rectPen=Pens.Black;

public Form1() {
    InitializeComponents();
    panel=new Panel();
    panel.Bounds=new Rectangle(…);
    panel.Paint+=panelPaintHandler;
    Controls.Add(panel);
}

protected void panelPaintHandler(object sender, PaintEventArgs e) {
    Graphics g=e.Graphics;
    if (paintRectFlag) g.DrawRectangle(rectPen, rect);
}

protected void buttonClickHandler(object sender, EventArgs e) {
    paintRectFlag=!paintRectFlag;   // toggle visible flag
    panel.Invalidate();
}

ServiceStartMode mode=ServiceStartMode.Parse(Me.cbStartMode.Text)
ob.SetPropertyValue("StartMode", mode)