private void printToolStripMenuItem_Click(object sender, EventArgs e)
{
// print graph
// set paper to landscape
chartControl1.OptionsPrint.SizeMode = DevExpress.XtraCharts.Printing.PrintSizeMode.Zoom;
//DevExpress.XtraPrinting.PrintingSystem ps = new DevExpress.XtraPrinting.PrintingSystem();
//ps.PageSettings.Landscape = true;
chartControl1.ShowPrintPreview();
}