سوال از پرینت از گرید ویو تلریک

RadPrintDocument doc = new RadPrintDocument();
doc.DefaultPageSettings.PaperSize = new System.Drawing.Printing.PaperSize("A4", 840, 1180);
doc.DefaultPageSettings.Landscape = true;

doc.DefaultPageSettings.Margins = new System.Drawing.Printing.Margins(50, 50, 100, 55);
doc.HeaderHeight = 30;
doc.FooterHeight = 85;

SolidBrush drawBrush = new SolidBrush(Color.Black);
doc.FooterFont = new Font("arial", 13, FontStyle.Underline | FontStyle.Bold , GraphicsUnit.World);

doc.HeaderFont = new Font("tahoma", 11);
ColumnGroupsViewDefinition cgv = new ColumnGroupsViewDefinition();

doc.AssociatedObject = this.radGridView1;
doc.PrintPage += doc_PrintPage;

RadPrintPreviewDialog dialog = new RadPrintPreviewDialog();
dialog.Document = doc;
dialog.ShowDialog();