Public Function GetLayerVisibility( _
   ByVal layerID As Integer _
) As Boolean

public bool GetLayerVisibility( 
   int layerID
)

<Grid x:Name="LayoutRoot" >
  
  <!-- 
  Add a Map Control and some basic instructions (the Label). Set the Extent to Central and South America. 
  -->
  <sdk:Label Height="71" HorizontalAlignment="Left" Margin="0,168,0,0" Name="Label2" 
       VerticalAlignment="Top" Width="205" >
    <TextBlock Text="The original ArcGISTiledMapServiceLayer with Default Visibility of sub-layers (shown left):" 
               TextWrapping="Wrap" Height="78" Width="188" />
  </sdk:Label>
  <esri:Map x:Name="Map1" WrapAround="True" HorizontalAlignment="Left" VerticalAlignment="Top" 
        Margin="0,238,0,0" Height="350" Width="205" Extent="-10223280,-1227779,-6845528,2924383">
    <!-- 
    Add an ArcGISTiledMapServiceLayer. Wire-up the Initilized Event to display a CheckBox for 
    each sub-layer's 'Default Visibility' returned from the map service. -->
    <esri:ArcGISTiledMapServiceLayer ID="World_Topo_Map"
          Url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer" 
          Initialized="ArcGISTiledMapServiceLayer_Initialized"/>
  </esri:Map>
  
  <!-- 
  Add a ListBox to display each sub-layer visibility. Embedded in each row of the ListBox will be a 
  CheckBox (one for each sub-layer). The user will not be able to interact with the CheckBoxes; they are
  for informational purposes only. 
  -->
  <sdk:Label Height="35" HorizontalAlignment="Left" Margin="211,204,0,0" Name="Label1" 
       VerticalAlignment="Top" Width="80" >
    <TextBlock Text="Sub-layer ID Visibility:" TextWrapping="Wrap" Height="35" Width="84" />
  </sdk:Label>
  <ListBox Height="350" HorizontalAlignment="Left" Margin="211,238,0,0" Name="ListBox1" 
           VerticalAlignment="Top" Width="80" />
  
  <!-- Nice GUI seperator to control the flow of the application look. -->
  <Rectangle Height="460" HorizontalAlignment="Left" Margin="319,132,0,0" Name="Rectangle1" 
             Stroke="Black" StrokeThickness="2" VerticalAlignment="Top" Width="1" />
  
  <!-- 
  Add a Button that will allow the user to add an ArcGISDynamicMapServiceLayer to another Map Control 
  that is based upon those sub-layers in the ArcGISTiledMapServiceLayer that had 
  'Default Visibility' = false in the map service. 
  -->
  <Button Name="Button1" Height="100" HorizontalAlignment="Left" Margin="367,129,0,0" 
          VerticalAlignment="Top" Width="205" Click="Button1_Click" >
    <TextBlock Text="Create a new ArcGISDynamicMapServiceLayer based upon the original ArcGISTiledMapServiceLayer.Url but showing just the sub-layers that had 'Default Visiblity=false'" 
               TextWrapping="Wrap" />
  </Button>
  <esri:Map Background="White" HorizontalAlignment="Left" Margin="365,238,0,0" Name="Map2" 
        VerticalAlignment="Top" WrapAround="True" Height="350" Width="205"
        Extent="-10223280,-1227779,-6845528,2924383"/>
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="126" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="642" 
             TextWrapping="Wrap" Text="When the application loads an ArcGISTiledMapServiceLayer 
             will automatically be added to the Map Contol (Map1). The ID of each sub-layer will be displayed as 
             a CheckBox. If the CheckBox is 'checked' that means the 'Default Visibility' = True for the 
             ArcGISTiledMapServiceLayer. Click the Button to generate a new ArcGISDynamicMapServiceLayer 
             based upon the URL of the original ArcGISTiledMapServiceLayer. Put the ArcGISDynamicMapServiceLayer 
             in a Map Control (Map2). The Initialized Event of the ArcGISDynamicMapServiceLayer will have code that 
             only displays those sub-layers in the ArcGISTiledMapServiceLayer that had a 'Default Visibility' = 
             False (i.e. those with CheckBoxes that were unchecked." />
   
</Grid>

// It is not possible to control the sub-layer visibility of an ArcGISTiledMapServiceLayer. This is because
// the cached tiles are pre-constructed on ArcGIS Server. These cached image tiles cannot be regenerated
// on-the-fly. If you need to show those sub-layers from an ArcGISTiledMapServiceLayer that were set to be
// invisible by the map service, what you can do is create an ArcGISDynamicMapServiceLayer using the URL
// of the ArcGISTiledMapServiceLayer. Then adjust the sub-layer visibility in the ArcGISDynamicMapServiceLayer
// to show those sub-layer that were defined as invisible in the map service.
            
private void ArcGISTiledMapServiceLayer_Initialized(object sender, System.EventArgs e)
{
  // When the ArcGISTiledMapServiceLayer Initializes get the visibility for each sub-layer. Add a
  // CheckBox for each sub-layer ID and set it to be checked if the sub-layer is visible as defined
  // by the map service.
  
  // Get the ArcGISTiledMapServiceLayer from the Map Control (Map1).
  ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer myArcGISTiledMapServiceLayer = null;
  myArcGISTiledMapServiceLayer = (ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer)(Map1.Layers["World_Topo_Map"]);
  
  // Get the count of the number of sub-layers in the ArcGISDynamicMapServiceLayer. 
  int numLayers = myArcGISTiledMapServiceLayer.Layers.Length;
  
  // Loop through each sub-layer.
  for (var i = 0; i < numLayers; i++)
  {
    // Get the sub-layer visibility.
    bool myLayerVisibility = myArcGISTiledMapServiceLayer.GetLayerVisibility(i);
    
    // Create a StackPanel to hold other Framework Element Controls.
    StackPanel myStackPanel = new StackPanel();
    myStackPanel.Orientation = Orientation.Horizontal;
    
    // Create a CheckBox to display if the sub-layer is visible or not.
    // Note the sub-layer ID is embedded as the .Tag for the CheckBox.
    CheckBox myCheckBox = new CheckBox();
    myCheckBox.Content = i.ToString();
    myCheckBox.IsChecked = myLayerVisibility;
    myCheckBox.Tag = i;
    myCheckBox.IsEnabled = false;
    myStackPanel.Children.Add(myCheckBox);
    
    // Add the StackPanel into the ListBox.
    ListBox1.Items.Add(myStackPanel);
  }
}
  
private void Button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
  // Create a new ArcGISDynamicMapServiceLayer using the URL from the ArcGISTiledMapServiceLayer. The
  // ArcGISDynamicMapServiceLayer will display the sub-layer that were invisible in the ArcGISImageServiceLayer.
  
  // Get the ArcGISTiledMapServiceLayer from the Map Control (Map1).
  ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer myArcGISTiledMapServiceLayer = null;
  myArcGISTiledMapServiceLayer = (ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer)(Map1.Layers["World_Topo_Map"]);
  
  // Create a new ArcGISDynamicMapServiceLayer using the URL from the ArcGISTiledMapServiceLayer.
  ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer myArcGISDynamicMapServiceLayer = new ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer();
  myArcGISDynamicMapServiceLayer.ID = "HiddenLayer";
  myArcGISDynamicMapServiceLayer.Url = myArcGISTiledMapServiceLayer.Url;
  
  // Wire-up the Initialized Event of the ArcGISDynamicMapServiceLayer. 
  myArcGISDynamicMapServiceLayer.Initialized += ArcGISDynamicMapServiceLayer_Initialized;
  
  // Add the ArcGISDynamicMapServiceLayer to the Map Control (Map2).
  Map2.Layers.Add(myArcGISDynamicMapServiceLayer);
}
  
private void ArcGISDynamicMapServiceLayer_Initialized(object sender, EventArgs e)
{
  // In order to change the visibility of the sub-layers in the ArcGISDynamicMapServiceLayer, you
  // need to perform this action in the Intialized Event or anytime after the Initialized Event occurs.
  // It was not possible to do this action in the Button Click Event because we did not have an asynchronous
  // round trip from ArcGIS Server yet!
  
  // Get the ArcGISDynamicMapServiceLayer from the Map Control (Map2).
  ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer myArcGISDynamicMapServiceLayer = new ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer();
  myArcGISDynamicMapServiceLayer = (ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer)(Map2.Layers["HiddenLayer"]);
  
  // Create a List to hold which sub-layers are visible. This will be used later to construct the array.
  List<int> myList = new List<int>();
  
  // Loop through each StackPanel in the ListBox.
  foreach (StackPanel myStackPanel in ListBox1.Items)
  {
    // Get the relevent information about the sub-layer visibility from the CheckBox.
    CheckBox myCheckBox = (CheckBox)(myStackPanel.Children[0]);
  
    // Add only those sub-layers that were considered invisible by the map service in the ArcGISDynamicMapServiceLayer
    // into the List.
    if (myCheckBox.IsChecked == false)
    {
      myList.Add(Convert.ToInt32(myCheckBox.Tag));
    }
  }
  
  // Create an Integer array from the List. It will hold only those sub-layer that are to be visible on the client.
  int[] myVisibleLayers = myList.ToArray();
  
  // Use the VisibleLayers Property to control which sub-layers are drawn.
  myArcGISDynamicMapServiceLayer.VisibleLayers = myVisibleLayers;
  
  // Refresh the ArcGISDynamicMapServiceLayer to show only those sub-layers we defined as being visible on the client.
  myArcGISDynamicMapServiceLayer.Refresh();
}

' It is not possible to control the sub-layer visibility of an ArcGISTiledMapServiceLayer. This is because
' the cached tiles are pre-constructed on ArcGIS Server. These cached image tiles cannot be regenerated
' on-the-fly. If you need to show those sub-layers from an ArcGISTiledMapServiceLayer that were set to be
' invisible by the map service, what you can do is create an ArcGISDynamicMapServiceLayer using the URL
' of the ArcGISTiledMapServiceLayer. Then adjust the sub-layer visibility in the ArcGISDynamicMapServiceLayer
' to show those sub-layer that were defined as invisible in the map service.
            
Private Sub ArcGISTiledMapServiceLayer_Initialized(sender As System.Object, e As System.EventArgs)
  
  ' When the ArcGISTiledMapServiceLayer Initializes get the visibility for each sub-layer. Add a
  ' CheckBox for each sub-layer ID and set it to be checked if the sub-layer is visible as defined
  ' by the map service.
  
  ' Get the ArcGISTiledMapServiceLayer from the Map Control (Map1).
  Dim myArcGISTiledMapServiceLayer As ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer
  myArcGISTiledMapServiceLayer = CType(Map1.Layers.Item("World_Topo_Map"), ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer)
  
  ' Get the count of the number of sub-layers in the ArcGISDynamicMapServiceLayer. 
  Dim numLayers As Integer = myArcGISTiledMapServiceLayer.Layers.Length
  
  ' Loop through each sub-layer.
  For i = 0 To numLayers - 1
    
    ' Get the sub-layer visibility.
    Dim myLayerVisibility As Boolean = myArcGISTiledMapServiceLayer.GetLayerVisibility(i)
    
    ' Create a StackPanel to hold other Framework Element Controls.
    Dim myStackPanel As New StackPanel
    myStackPanel.Orientation = Orientation.Horizontal
    
    ' Create a CheckBox to display if the sub-layer is visible or not.
    ' Note the sub-layer ID is embedded as the .Tag for the CheckBox.
    Dim myCheckBox As New CheckBox
    myCheckBox.Content = i.ToString
    myCheckBox.IsChecked = myLayerVisibility
    myCheckBox.Tag = i
    myCheckBox.IsEnabled = False
    myStackPanel.Children.Add(myCheckBox)
    
    ' Add the StackPanel into the ListBox.
    ListBox1.Items.Add(myStackPanel)
    
  Next
  
End Sub
            
Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
  
  ' Create a new ArcGISDynamicMapServiceLayer using the URL from the ArcGISTiledMapServiceLayer. The
  ' ArcGISDynamicMapServiceLayer will display the sub-layer that were invisible in the ArcGISImageServiceLayer.
  
  ' Get the ArcGISTiledMapServiceLayer from the Map Control (Map1).
  Dim myArcGISTiledMapServiceLayer As ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer
  myArcGISTiledMapServiceLayer = CType(Map1.Layers.Item("World_Topo_Map"), ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer)
  
  ' Create a new ArcGISDynamicMapServiceLayer using the URL from the ArcGISTiledMapServiceLayer.
  Dim myArcGISDynamicMapServiceLayer As New ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer
  myArcGISDynamicMapServiceLayer.ID = "HiddenLayer"
  myArcGISDynamicMapServiceLayer.Url = myArcGISTiledMapServiceLayer.Url
  
  ' Wire-up the Initialized Event of the ArcGISDynamicMapServiceLayer. 
  AddHandler myArcGISDynamicMapServiceLayer.Initialized, AddressOf ArcGISDynamicMapServiceLayer_Initialized
  
  ' Add the ArcGISDynamicMapServiceLayer to the Map Control (Map2).
  Map2.Layers.Add(myArcGISDynamicMapServiceLayer)
  
End Sub
            
Private Sub ArcGISDynamicMapServiceLayer_Initialized(sender As Object, e As EventArgs)
  
  ' In order to change the visibility of the sub-layers in the ArcGISDynamicMapServiceLayer, you
  ' need to perform this action in the Intialized Event or anytime after the Initialized Event occurs.
  ' It was not possible to do this action in the Button Click Event because we did not have an asynchronous
  ' round trip from ArcGIS Server yet!
  
  ' Get the ArcGISDynamicMapServiceLayer from the Map Control (Map2).
  Dim myArcGISDynamicMapServiceLayer As New ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer
  myArcGISDynamicMapServiceLayer = CType(Map2.Layers.Item("HiddenLayer"), ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer)
  
  ' Create a List to hold which sub-layers are visible. This will be used later to construct the array.
  Dim myList As New List(Of Integer)
  
  ' Loop through each StackPanel in the ListBox.
  For Each myStackPanel As StackPanel In ListBox1.Items
    
    ' Get the relevent information about the sub-layer visibility from the CheckBox.
    Dim myCheckBox As CheckBox = CType(myStackPanel.Children.Item(0), CheckBox)
    
    ' Add only those sub-layers that were considered invisible by the map service in the ArcGISDynamicMapServiceLayer
    ' into the List.
    If myCheckBox.IsChecked = False Then
      myList.Add(CInt(myCheckBox.Tag))
    End If
    
  Next
  
  ' Create an Integer array from the List. It will hold only those sub-layer that are to be visible on the client.
  Dim myVisibleLayers() As Integer = myList.ToArray
  
  ' Use the VisibleLayers Property to control which sub-layers are drawn.
  myArcGISDynamicMapServiceLayer.VisibleLayers = myVisibleLayers
  
  ' Refresh the ArcGISDynamicMapServiceLayer to show only those sub-layers we defined as being visible on the client.
  myArcGISDynamicMapServiceLayer.Refresh()
  
End Sub