while (k < dt.Tables[0].Rows.Count)
                  {
                    //add all test name of the same Event
                    if (Convert.ToDecimal(dt.Tables[0].Rows[k]["Evento"].ToString()) == lastevent)
                    {  


                      dr["Result"] = dr["Result"].ToString() + ","+ "  "+ dt.Tables[0].Rows[k]["Testo"].ToString();
                      k = k + 1;
                      
                    
                      
                    }//end while

                    else
                    {
                    break;
                    }

                                
                  }