SortByCondition Class

using System.Windows;
using DevExpress.Xpf.PivotGrid;

namespace DXPivotGrid_SortBySummary {
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            pivotGridControl1.DataSource = 
                (new nwindDataSetTableAdapters.SalesPersonTableAdapter()).GetData();
        }
        private void pivotGridControl1_Loaded(object sender, RoutedEventArgs e) {

            // Locks the pivot grid from updating while the Sort by Summary 
            // settings are being customized. 
            pivotGridControl1.BeginUpdate();
            try {

                // Specifies a data field whose summary values should be used to sort values 
                // of the Product Name field. 
                fieldProductName.SortByField = fieldUnitPrice;

                // Specifies a column by which the Product Name field values should be sorted. 
                fieldProductName.SortByConditions.Add(new SortByCondition(fieldYear, "1994"));
                fieldProductName.SortByConditions.Add(new SortByCondition(fieldMonth, "9"));
            }
            finally {

                // Unlocks the pivot grid and applies changes. 
                pivotGridControl1.EndUpdate();
            }
        }
    }
}

<Window xmlns:dxpg="http://schemas.devexpress.com/winfx/2008/xaml/pivotgrid" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        x:Class="DXPivotGrid_SortBySummary.MainWindow" 
        Height="600" Width="800" Title="Main Window">
    <Grid>
        <dxpg:PivotGridControl Name="pivotGridControl1" Loaded="pivotGridControl1_Loaded">
            <dxpg:PivotGridControl.Fields>
                <dxpg:PivotGridField Name="fieldUnitPrice" FieldName="UnitPrice" Area="DataArea"/>
                <dxpg:PivotGridField Name="fieldYear" FieldName="OrderDate" Area="ColumnArea" 
                                     Caption="Year" GroupInterval="DateYear"/>
                <dxpg:PivotGridField Name="fieldMonth" FieldName="OrderDate" Area="ColumnArea" 
                                     Caption="Month" GroupInterval="DateMonth"/>
                <dxpg:PivotGridField Name="fieldCategoryName" FieldName="CategoryName" 
                                     Area="RowArea" Caption="Category"/>
                <dxpg:PivotGridField Name="fieldProductName" FieldName="ProductName" 
                                     Area="RowArea" Caption="Product"/>
                <dxpg:PivotGridField Name="fieldQuantity" FieldName="Quantity" Area="DataArea"/>
            </dxpg:PivotGridControl.Fields>
        </dxpg:PivotGridControl>
    </Grid>
</Window>

Imports Microsoft.VisualBasic
Imports System.Windows
Imports DevExpress.Xpf.PivotGrid

Namespace DXPivotGrid_SortBySummary
    Partial Public Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
            pivotGridControl1.DataSource = _
                (New nwindDataSetTableAdapters.SalesPersonTableAdapter()).GetData()
        End Sub
        Private Sub pivotGridControl1_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)

            ' Locks the pivot grid from updating while the Sort by Summary
            ' settings are being customized.
            pivotGridControl1.BeginUpdate()
            Try

                ' Specifies a data field whose summary values should be used to sort values
                ' of the Product Name field.
                fieldProductName.SortByField = fieldUnitPrice

                ' Specifies a column by which the Product Name field values should be sorted.
                fieldProductName.SortByConditions.Add(New SortByCondition(fieldYear, "1994"))
                fieldProductName.SortByConditions.Add(New SortByCondition(fieldMonth, "9"))
            Finally

                ' Unlocks the pivot grid and applies changes.
                pivotGridControl1.EndUpdate()
            End Try
        End Sub
    End Class
End Namespace