internal static void SaveFile() { var excelPackage = DataToExcel.CopyDBtoExcel(); SaveFileDialog saveFileDialog = new(); saveFileDialog.Filter = "xlsx files (*.xlsx)|*.xlsx|xls files (*.xls)|*.xls"; saveFileDialog.FilterIndex = 1; if (saveFileDialog.ShowDialog() == true) { FileInfo fi = new FileInfo(saveFileDialog.FileName); excelPackage.SaveAs(fi); } }