public class WmsDataProvider :
    FullRequestedImageDataProvider,
    IWmsContextProvider,
    IFullRequestedContextProvider,
    IUnitConverterProvider

Public Class WmsDataProvider
    Inherits FullRequestedImageDataProvider
    Implements IWmsContextProvider,
               IFullRequestedContextProvider,
               IUnitConverterProvider

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map"
    xmlns:Properties="clr-namespace:WpfWmsExample.Properties"
    x:Class="WpfWmsExample.MainWindow"
    Title="MainWindow" Height="360" Width="640">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="3*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <dxm:MapControl Grid.Column="0"
            IsManipulationEnabled="False">
            <dxm:ImageLayer>
                <dxm:WmsDataProvider x:Name="Provider" 
                    ServerUri="http://Your_Server_URI" 
                    ActiveLayerName="{Binding ElementName=listBox, Path=SelectedItem.Name}"
                    ResponseCapabilities="OnResponseCapabilities"/>
            </dxm:ImageLayer>
        </dxm:MapControl>
        <StackPanel Grid.Column="1">
            <TextBlock Text="Available layers:"/>
            <ListBox x:Name="listBox"
                SelectedIndex="0"
                Background="AliceBlue" 
                DisplayMemberPath="Name" 
                Height="311"/>
        </StackPanel>
    </Grid>
</Window>

Imports System.Windows
Imports DevExpress.Xpf.Map

Namespace WpfWmsExample
    ''' <summary>
    ''' Interaction logic for MainWindow.xaml
    ''' </summary>
    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()
        End Sub
        Private Sub OnResponseCapabilities(ByVal sender As Object, ByVal e As CapabilitiesRespondedEventArgs)
            listBox.ItemsSource = e.Layers
        End Sub
    End Class
End Namespace

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

namespace WpfWmsExample {
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
        }
        private void OnResponseCapabilities(object sender, CapabilitiesRespondedEventArgs e) {
            listBox.ItemsSource = e.Layers;
        }
    }
}