public LayerCollection Layers { get; }

Public ReadOnly Property Layers As LayerCollection

using DevExpress.XtraMap;
// ...
const string azureKey = "your key";
// ...
private void Form1_Load(object sender, EventArgs e) {
    // Create a map control.
    MapControl map = new MapControl();
    // Specify the map position on the form.           
    map.Dock = DockStyle.Fill;
    // Create a layer.
    ImageLayer layer1 = new ImageLayer();
    layer1.DataProvider = new AzureMapDataProvider() {
        AzureKey = azureKey,
        // Set Imagery tileset to display a satellite or aerial imagery on a layer.
        Tileset = AzureTileset.Imagery,
    };
    // Create a layer.
    ImageLayer layer2 = new ImageLayer();
    layer2.DataProvider = new AzureMapDataProvider(){
        AzureKey = azureKey,
        // Set BaseLabelsRoad tileset to display boundaries and label data in the Azure Map style on a layer.
        Tileset = AzureTileset.BaseLabelsRoad,
    };

    // Specify the map zoom level and center point. 
    map.ZoomLevel = 3;
    map.CenterPoint = new GeoPoint(40, -100);
    // Add the created layers to the collection.
    map.Layers.AddRange(new LayerBase[] {
        layer1, layer2});
    // Add the map control to the window.
    this.Controls.Add(map);
}

Imports DevExpress.XtraMap
'...
Private Const azureKey As String = "your key"
' ...
Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    ' Create a map control.
    Dim map As New MapControl()
    ' Specify the map position on the form.           
    map.Dock = DockStyle.Fill
    ' Create a layer.
    Dim layer1 As New ImageLayer()
    layer1.DataProvider = New AzureMapDataProvider() With {
        .AzureKey = azureKey,
        .Tileset = AzureTileset.Imagery
    }
    ' Create a layer.
    Dim layer2 As New ImageLayer()
    layer2.DataProvider = New AzureMapDataProvider() With {
        .AzureKey = azureKey,
        .Tileset = AzureTileset.BaseLabelsRoad
    }

    ' Specify the map zoom level and center point. 
    map.ZoomLevel = 3
    map.CenterPoint = New GeoPoint(40, -100)
    ' Add the created layers to the collection.
    map.Layers.AddRange(New LayerBase() { layer1, layer2})
    ' Add the map control to the window.
    Me.Controls.Add(map)
End Sub

VectorItemsLayer MapLayer { get { return (VectorItemsLayer)mapControl1.Layers["MapLayer"]; } }

{
    VectorItemsLayer vl = this.mapControl1.Layers[0] as VectorItemsLayer;
    if (vl != null)

VectorItemsLayer KmlLayer { get { return (VectorItemsLayer)mapControl1.Layers["KmlLayer"]; } }

int requestsCounter = 0;
ImageLayer Layer { get { return (ImageLayer)mapControl1.Layers[0]; } }

VectorItemsLayer layer = (VectorItemsLayer)this.map.Layers[2];

Get
    Return CType(Me.mapControl1.Layers("MapLayer"), DevExpress.XtraMap.VectorItemsLayer)
End Get

If dialog.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
    Dim vl As VectorItemsLayer = TryCast(Me.mapControl1.Layers(0), VectorItemsLayer)
    If vl IsNot Nothing Then

Get
    Return CType(mapControl1.Layers("KmlLayer"), VectorItemsLayer)
End Get

Get
    Return CType(mapControl1.Layers(0), ImageLayer)
End Get

pin.Location = geoPoint
Dim layer As VectorItemsLayer = CType(map.Layers(2), VectorItemsLayer)
CType(layer.Data, MapItemStorage).Items.Add(pin)