Printing group footer for every ship city

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Now that we have seen how to print a group header and control its printing, let's add a group footer that will display the number of orders from each city. We need to:

1. Add a "OrdersPerCity" NumberColumn that will store the number of orders This column will be updated with 0 in the GroupEnter and accumulate its value in the OnLeaveRow
2. Add a CitySuffix layout section and place the "OrdersPerCity" column
3. Add the GroupLeave and add the WriteTo of the new section

public readonly NumberColumn OrdersPerCity = new NumberColumn("Orders Per City");
public Print_Orders()
{
    Groups[Orders1.ShipCity].Enter += () =>
    {
        _layout.Customer.WriteTo(_ioPrint_Order);
        OrdersPerCity.Value = 0;
    };
    Groups[Orders1.ShipCity].Leave += () =>
    {
        _layout.GroupLeave.WriteTo(_ioPrint_Order);
    };
}
protected override void OnLeaveRow()
{
    OrdersPerCity.Value++;
    _layout.Body.WriteTo(_ioPrint_Order);
} 

And this is the result:

• Exercise Using Groups

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