ObjectContext objectContext3 = ((IObjectContextAdapter)dataEntities).ObjectContext;
                ObjectSet<STUDENT> students = objectContext3.CreateObjectSet<STUDENT>();
                    var query4 =
                    from STUDENT in students
                    orderby STUDENT.NameID
                    select new { STUDENT.DOB, STUDENT.NameID };
                    userDataGrid.ItemsSource = query4.ToList();
                    userDataGrid.UpdateLayout();

private void deleteRow_Click(object sender, RoutedEventArgs e)
    {
        DataGrid dg = this.userDataGrid;

        if (dg != null)
        {
            var toDelete = (IList)dg.SelectedItems;//<-- Datagrid.SelectedItems
            var collection = toDelete.Cast<DataRowView>();
            var list = new List<DataRowView>(collection);

            foreach (var item in list)
            {
                item.Row.Delete();
            }
        }
    }