WPF Datagrid row header show auto row number

******************* XAML Code *******************

<DataGrid.RowHeaderTemplate>

                    <DataTemplate>
                        <TextBlock Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type DataGridRow}},Path=Header}" />
                    </DataTemplate>
                </DataGrid.RowHeaderTemplate>

******************* VB Code *******************
Private Sub dgCategoryView_LoadingRow(sender As Object, e As DataGridRowEventArgs) Handles dgCategoryView.LoadingRow

    e.Row.Header = (e.Row.GetIndex + 1).ToString
End Sub