[DefaultValue(null)]
public MapImageDataProviderBase DataProvider { get; set; }

<DefaultValue(Nothing)>
Public Property DataProvider As MapImageDataProviderBase

using DevExpress.XtraMap;
using System.Windows.Forms;

namespace ResponseCapabilitiesHandler {
    public partial class Form1 : Form {
        ImageLayer WmsLayer {
            get { return (ImageLayer)mapControl.Layers["WmsImageLayer"]; }
        }
        WmsDataProvider Provider {
            get { return WmsLayer.DataProvider as WmsDataProvider; }
        }
        public Form1() {
            InitializeComponent();
        }
        private void Form1_Load(object sender, System.EventArgs e) {
            // Handle the ResponseCapabilities event.
            Provider.ResponseCapabilities += OnResponseCapabalities;
        }
        void OnResponseCapabalities(object sender, CapabilitiesRespondedEventArgs e) {
            // Specify an active layer for the map control.
            Provider.ActiveLayerName = e.Layers[0].Name;
            // Recieve information on the active layer.
            label1.Text = string.Format("Layer name: {0}, Layer title: {1}", e.Layers[0].Name, e.Layers[0].Title);           
        }
    }
}

Imports DevExpress.XtraMap
Imports System.Windows.Forms

Namespace ResponseCapabilitiesHandler
    Partial Public Class Form1
        Inherits Form

        Private ReadOnly Property WmsLayer() As ImageLayer
            Get
                Return CType(mapControl.Layers("WmsImageLayer"), ImageLayer)
            End Get
        End Property
        Private ReadOnly Property Provider() As WmsDataProvider
            Get
                Return TryCast(WmsLayer.DataProvider, WmsDataProvider)
            End Get
        End Property
        Public Sub New()
            InitializeComponent()
        End Sub
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
            ' Handle the ResponseCapabilities event.
            AddHandler Provider.ResponseCapabilities, AddressOf OnResponseCapabalities
        End Sub
        Private Sub OnResponseCapabalities(ByVal sender As Object, ByVal e As CapabilitiesRespondedEventArgs)
            ' Specify an active layer for the map control.
            Provider.ActiveLayerName = e.Layers(0).Name
            ' Recieve information on the active layer.
            label1.Text = String.Format("Layer name: {0}, Layer title: {1}", e.Layers(0).Name, e.Layers(0).Title)
        End Sub
    End Class
End Namespace

map.Layers.Add(vectorLayer);
imageLayer.DataProvider = new AzureMapDataProvider() { AzureKey = azureKey };
labels.DataProvider = new AzureMapDataProvider() { AzureKey = azureKey, Tileset = AzureTileset.BaseLabelsRoad};

ImageLayer tileLayer = new ImageLayer();
tileLayer.DataProvider = new AzureMapDataProvider() { AzureKey = "Your Bing key here." };
map.Layers.Add(tileLayer);

BingMapDataProvider bingProvider = new BingMapDataProvider();
tilesLayer.DataProvider = bingProvider;
bingProvider.BingKey = yourBingKey;

OpenStreetMapDataProvider provider = new OpenStreetMapDataProvider();
tileLayer.DataProvider = provider;

map.Layers.Add(imageTilesLayer);
imageTilesLayer.DataProvider = new LocalProvider();

map.Layers.Add(vectorLayer)
imageLayer.DataProvider = New AzureMapDataProvider() With {.AzureKey = azureKey}
labels.DataProvider = New AzureMapDataProvider() With {

Dim imageLayer As New ImageLayer()
imageLayer.DataProvider = New AzureMapDataProvider() With {
.AzureKey = azureKey,

Dim tileLayer As ImageLayer = New ImageLayer()
tileLayer.DataProvider = New AzureMapDataProvider() With {.AzureKey = "Your Bing key here."}
map.Layers.Add(tileLayer)

Dim bingProvider As BingMapDataProvider = New BingMapDataProvider()
tilesLayer.DataProvider = bingProvider
bingProvider.BingKey = yourBingKey

Dim provider As OpenStreetMapDataProvider = New OpenStreetMapDataProvider()
tileLayer.DataProvider = provider
' Specify a template that is used to obtain image tiles.