System.IO.File.WriteAllBytes(saveFileDialog.FileName, Report.FileArray);
var fileLocation = saveFileDialog.InitialDirectory + saveFileDialog.FileName;
Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
Workbook wb = excel.Workbooks.Open(fileLocation);
Worksheet ws1 = wb.Worksheets.get_Item("English");
ws1.Range["E5"].Value = StartDate;
ws1.Range["G5"].Value = EndDate;
wb.SaveAs(fileLocation, AccessMode: XlSaveAsAccessMode.xlShared);
Process.Start(fileLocation);