string expath = "\\\\server12\\websql\\test.xls";

                ExcelObj = new Excel.Application();
                if (ExcelObj == null)
                {
                    this.LabelINF.Text = "ERROR: EXCEL couldn't be started!";
                }

                Excel.Workbook theWorkbook =
                    ExcelObj.Workbooks.Open(expath, 0, false, 5,
                    "", "", true, Excel.XlPlatform.xlWindows, "\t", true, false,
                    0, true, null, null);

                theWorkbook.SaveAs("\\\\server12\\websql\\test2.xls", Excel.XlFileFormat.xlWorkbookNormal,
                                         Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                                         Excel.XlSaveAsAccessMode.xlShared, Type.Missing,
                                         Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                theWorkbook.Close(Excel.XlSaveAction.xlSaveChanges, "\\\\server12\\websql\\test2.xls", Type.Missing);