c# - populate objectlistview using datatable list -


im work objectlistview , trouble populate data database list , here code 

    static internal list<birthday> getbirthdays()     {         if (birthday.alldata.count == 0)             birthday.alldata = birthday.initializedata();         return birthday.alldata;     }     static private list<birthday> alldata = new list<birthday>();      static private list<birthday> initializedata()     {         koneksi con = new koneksi();         var qcmd = "select nm, sex, replace(hp, ' ', '') hp, datediff(year, left(tgllhr, 4), '2016') umur, alamat  " +                     "from mcif " +                     "where right(tgllhr, 4) = 20160615";           con.sqlquery(qcmd);          list<birthday> birthdaylist = new list<birthday>();         using (datatable dt = con.queryex())         {             birthdaylist = (from datarow dr in dt.rows                         select new birthday()                        {                            nama = convert.tostring(dr["nm"]),                            sex = convert.tostring(dr["sex"]),                            hp = convert.tostring(dr["hp"]),                            umur = convert.toint32(dr["umur"]),                            alamat = convert.tostring(dr["alamat"])                        }).tolist();          }

and connection 

public class koneksi {       private sqlconnection _con;     private sqlcommand cmd;     private sqldataadapter _da;     private datatable _dt;       public koneksi(string connectionstring=null)     {         var myini = new inifile("setting.ini");         string database = myini.read("set1", "database");         string userdb = myini.read("set2", "database");         string passdb = myini.read("set3", "database");         string locdb = myini.read("set4", "database");          _con = new sqlconnection(connectionstring??@"data source=" + locdb + ";initial catalog=" + database + "; user id=" + userdb + ";password=" + passdb + "");         _con.open();      }      public void sqlquery(string querytext)     {         cmd = new sqlcommand(querytext, _con);     }      public datatable queryex()     {         _da = new sqldataadapter(cmd);         _dt = new datatable();         _da.fill(_dt);         return _dt;     }   }

this code in form :

private void initializedataolv()     {           this.flv.setobjects(birthday.getbirthdays());     }

i have try several example this olv still empty, still beginner using model list


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