public partial class MainWindow : Window
{

    public ObservableCollection<int> TableData
    {
        get
        {
            return _myTable;
        }
    }

    ...

    private void DG1_LoadingRow(object sender, DataGridRowEventArgs e)
    {
        if (_currentRow - RowBufferSize < e.Row.GetIndex())
        {
            AddPageToTable();
        }
    }

    private bool AddPageToTable()
    {
        for (int i = 0; i < PageSize; i++)
        {
            _myTable.Add(_newDataEnumerator.Current);
            _newDataEnumerator.MoveNext();
            _currentRow++;
        }
        return true;
    }
}

<DataGrid Name="DG1" ItemsSource="{Binding TableData}" AutoGenerateColumns="True" LoadingRow="DG1_LoadingRow">
   <DataGrid.Columns>
      <DataGridTextColumn Header="Data"  Binding="{Binding}" Width="400"/>
   </DataGrid.Columns>
</DataGrid>