[NonCategorized]
public class SearchBoundingBox :
    MapDependencyObject

<NonCategorized>
Public Class SearchBoundingBox
    Inherits MapDependencyObject

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        xmlns:local="clr-namespace:CalculateRoutesByAddresses"
        xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
        xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map" 
        x:Class="CalculateRoutesByAddresses.MainWindow"
        Title="MainWindow" Height="360" Width="640"
        dx:ThemeManager.ThemeName="Office2016White"
        Loaded="OnLoaded">
    <Window.Resources>
        <sys:String x:Key="bingKey">Your Bing Key</sys:String>
    </Window.Resources>
    <Grid>
        <dxm:MapControl x:Name="mapControl">
            <dxm:ImageLayer>
                <dxm:BingMapDataProvider BingKey="{Binding Source={StaticResource bingKey}}"/>
            </dxm:ImageLayer>
            <dxm:InformationLayer>
                <dxm:BingRouteDataProvider x:Name="routeProvider"
                                           RouteCalculated="OnRouteCalculated"
                                           BingKey="{Binding Source={StaticResource bingKey}}"/>
            </dxm:InformationLayer>
        </dxm:MapControl>
        <dx:WaitIndicator x:Name="waitIndicator"
                          DeferedVisibility="True" 
                          Content="Calculating route...">
        </dx:WaitIndicator>
    </Grid>
</Window>

Imports DevExpress.Xpf.Map
Imports System.Collections.Generic
Imports System.Windows

Namespace CalculateRoutesByAddresses
    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub OnLoaded(ByVal sender As Object, ByVal e As RoutedEventArgs)
            routeProvider.CalculateRoute(New List(Of RouteWaypoint) From { _
                New RouteWaypoint("New York", "Belmont Park, New York, USA"), _
                New RouteWaypoint("Las Vegas", "Lorenzi Park, Las Vegas, USA") _
            })
        End Sub

        Private Sub OnRouteCalculated(ByVal sender As Object, ByVal e As BingRouteCalculatedEventArgs)
            Dim box As SearchBoundingBox = e.CalculationResult.RouteResults(0).BoundingBox
            Dim topLeft As GeoPoint = New GeoPoint With {.Latitude = box.NorthLatitude, .Longitude = box.WestLongitude}
            Dim bottomRight As GeoPoint = New GeoPoint With {.Latitude = box.SouthLatitude, .Longitude = box.EastLongitude}
            mapControl.ZoomToRegion(topLeft, bottomRight, 0.4)
            waitIndicator.DeferedVisibility = False
        End Sub
    End Class
End Namespace

using DevExpress.Xpf.Map;
using System.Collections.Generic;
using System.Windows;

namespace CalculateRoutesByAddresses {
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
        }

        private void OnLoaded(object sender, RoutedEventArgs e) {
            routeProvider.CalculateRoute(new List<RouteWaypoint> {
                new RouteWaypoint("New York", "Belmont Park, New York, USA"),
                new RouteWaypoint("Las Vegas", "Lorenzi Park, Las Vegas, USA")
            });
        }

        private void OnRouteCalculated(object sender, BingRouteCalculatedEventArgs e) {
            SearchBoundingBox box = e.CalculationResult.RouteResults[0].BoundingBox;
            GeoPoint topLeft = new GeoPoint {
                Latitude = box.NorthLatitude,
                Longitude = box.WestLongitude
            };
            GeoPoint bottomRight = new GeoPoint {
                Latitude = box.SouthLatitude,
                Longitude = box.EastLongitude
            };
            mapControl.ZoomToRegion(topLeft, bottomRight, 0.4);
            waitIndicator.DeferedVisibility = false;
        }
    }
}