[방법1] private void BTN_PREVIEW_Click(object sender, EventArgs e) { Excel.Application xlApp = null; Excel._Workbook wb = null; Excel.Worksheet ws = null; try { xlApp = new Excel.Application(); //excelApp.ActivePrinter = PrinterSettings.InstalledPrinters[3]; wb = xlApp.Workbooks.Add(PrjOutlineFile); if (wb == null) return; xlApp.Visible = true; xlApp.Sheets.PrintPr..