C# WPF and Sqlite: Datagrid displays last table recording when trying to read from an sqlite database table -

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i can't figure why data grid displaying last table recording sqlite database. here code i've writen.

    observablecollection<activity> _activitieslist = new observablecollection<activity>();      while (reader.read()) {    _act.name = reader.getstring(reader.getordinal("activity"));    _act.customer = reader.getstring(reader.getordinal("activitycustomer"));    _act.activitytpe = reader.getstring(reader.getordinal("activitynature"));    string st = reader.getstring(reader.getordinal("startedat"));    _act.startedat = convert.todatetime(st);    string et = reader.getstring(reader.getordinal("finishedat"));    _act.endedat = convert.todatetime(et);    //string _ratio = reader.getstring(reader.getordinal("activityratio"));    //_act.activityratio = convert.todouble(_ratio);    _act.notes = reader.getstring(reader.getordinal("notes"));    string _hldy = reader.getstring(reader.getordinal("holiday"));    _act.isholiday = convert.toboolean(_hldy);    _activitieslist.add(_act); } activitiesdatagrid.itemssource=_activitieslist;

can create new object instance "activity" class in inside while loop.

 observablecollection<activity> _activitieslist = new observablecollection<activity>();  **while (reader.read())             {                 ***_act = new activity();***                 _act.name = reader.getstring(reader.getordinal("activity"));                ....                ....              }**

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