How do I add row to datagrid in WPF dynamically?

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WPF

Hello,

I have datagrid of WPF with the name dgSchedule.I already have rows in datagrid.I want to add new row dynamically to the datagrid.

I have tried following but new row wasn't displayed in datagrid.

What I have tried:

ObservableCollection<states> stlist = new ObservableCollection<states>();
foreach (States row in dgSchedule.Items)
    stlist.Add(row);

stlist.Add(s);//Where s is empty list
dgSchedule = null;
dgSchedule = new DataGrid();
dgSchedule.ItemsSource = stlist;