Export Excel with Aspose

 private bool SaveFile(List<Object> list, out string url, string templateName)  
 {  
      try  
      {  
           var designer = new WorkbookDesigner();  
           var serverpath = new StringBuilder();  
           serverpath.Append(AppDomain.CurrentDomain.BaseDirectory);  
           var path = serverpath + templateName;  
           designer.Workbook = new Workbook(path);  
           var worksheet = designer.Workbook.Worksheets[0];  
           designer.SetDataSource("Export", list);  
           ////Process the markers  
           designer.Process(false);  
           worksheet.Cells["A2"].PutValue("Ngày: " + list[0].CreatedDay.ToString("dd/MM/yyyy"));  
           ////Save the Excel file.  
           var namefile = "XuatFile_" + DateTime.Now.ToString("ddMMyyyyhhmmss") + ".xlsx";  
           url = serverpath + "/Send_Save/" + namefile;  
           worksheet.Name = "XuatFile_" + DateTime.Now.ToString("ddMMyyyyhhmmss");  
           designer.Workbook.Save(url, SaveFormat.xlsx);  
           _log.Info(DateTime.Now.ToString("dd-MM-yyyy HH mm ss " + namefile));  
           return true;  
      }  
      catch (Exception e)  
      {  
           url = "";  
           _log.Info("luu file that bai");  
           _log.Info("InnerException {0} StackTrace {1} Message {2}", e.InnerException, e.StackTrace,  
                e.Message);  
           return false;  
           throw;  
      }  
 }  

FILE TEMPLATE EXAMPLE