Public Sub AddBookmark( _
   ByVal name As String, _
   ByVal extent As Envelope _
) 

public void AddBookmark( 
   string name,
   Envelope extent
)

<Grid x:Name="LayoutRoot" Background="White">
  
  <!-- 
  Use the Resources section to hold a Style for setting the appearance and behavior of the Bookmark Control. 
  Don't forget to add following XAML Namespace definitions to the correct location in your code:
  xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" 
  xmlns:esri="http://schemas.esri.com/arcgis/client/2009" 
  -->
  <Grid.Resources>
  
    <!--
    The majority of the XAML that defines the ControlTemplate for the Bookmark Control was obtained
    by using Microsoft Blend. See the blog post entitled: 'Use control templates to customize the 
    look and feel of ArcGIS controls' at the following Url for general How-To background:
    http://blogs.esri.com/Dev/blogs/silverlightwpf/archive/2010/05/20/Use-control-templates-to-customize-the-look-and-feel-of-ArcGIS-controls.aspx
    -->
    <Style x:Key="BookmarkStyle1" TargetType="esri:Bookmark">
      <Setter Property="MaxHeight" Value="200"/>
      <Setter Property="Width" Value="120"/>
      <Setter Property="Background" Value="#99000000"/>
    
      <!-- The Title.Value was modified. -->
      <Setter Property="Title" Value="Four Corners Kiosk"/>
      
      <Setter Property="BorderThickness" Value="1"/>
      <Setter Property="BorderBrush" Value="White"/>
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="esri:Bookmark">
            <Grid Background="Yellow">
              <Grid.RowDefinitions>
                <RowDefinition Height="25"/>
                  
                <!-- Changed the Height for better visual appeal. -->
                <RowDefinition Height="1"/>
                                 
                <RowDefinition Height="*"/>
                <RowDefinition Height="25"/>
              </Grid.RowDefinitions>
              <Border BorderBrush="{TemplateBinding BorderBrush}" 
                      BorderThickness="{TemplateBinding BorderThickness}" 
                      Background="{TemplateBinding Background}" 
                      CornerRadius="5" 
                      Grid.RowSpan="4"/>
              <TextBlock Foreground="Black" FontWeight="Bold" FontSize="12" 
                         FontFamily="Verdana" Margin="5,5,5,0" 
                         Grid.Row="0" Text="{TemplateBinding Title}"/>
                 
              <!-- Comment out the entire section that allows users to add bookmarks. Since 
              this is a Kiosk Application, we do not want users to make any changes.
              -->
              <!--
              <Grid Margin="5,0,5,0" Grid.Row="1">
                <Grid.ColumnDefinitions>
                  <ColumnDefinition Width="*"/>
                  <ColumnDefinition Width="30"/>
                </Grid.ColumnDefinitions>
                <TextBox x:Name="AddBookmarkName" Grid.Column="0" Width="200"/>
                <Button x:Name="AddBookmark" Content="+" Grid.Column="1" />
              </Grid>
              -->
                            
              <!-- Add the IsReadOnly Attribute to disable the user from editing the bookmark names. -->
              <sdk:DataGrid x:Name="BookmarkList" AutoGenerateColumns="False" CanUserResizeColumns="False" 
                            CanUserReorderColumns="False" HeadersVisibility="None" Margin="5,0,5,0" 
                            Grid.Row="2" RowHeight="16" RowDetailsVisibilityMode="Collapsed" 
                            TabNavigation="Local" Visibility="Visible" IsReadOnly="True" >
                <sdk:DataGrid.Columns>
                <sdk:DataGridTextColumn Binding="{Binding Name, Mode=TwoWay}" Foreground="Black" 
                                        FontSize="10" FontFamily="Times" Header="Bookmark" 
                                        IsReadOnly="False" Width="{TemplateBinding Width}"/>
                </sdk:DataGrid.Columns>
              </sdk:DataGrid>
              
              <!-- Comment out the entire section that allows users to delete bookmarks. Since 
              this is a Kiosk Application, we do not want users to make any changes.
              -->
              <!--
              <Grid Margin="5,0,5,5" Grid.Row="3">
                <Grid.ColumnDefinitions>
                  <ColumnDefinition Width="*"/>
                  <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <Button x:Name="ClearBookmarks" Content="Clear All" Grid.Column="0"/> 
              </Grid>
              -->
                              
            </Grid>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>
  </Grid.Resources>
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="70" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="626" 
             TextWrapping="Wrap" Margin="2,9,0,0" 
             Text="This example code shows disabling some of the features of the Bookmark Control to create
                  a kiosk type of application. Users are not allowed to make any editable changes to the Bookmark
                  Control. To use: Click the various preset bookmarks to see the Four Corners area of the 
                  United States." />
  
  <!-- Add a Map Control to the application and define an intial Map.Extent to the Four Corners states. -->
  <esri:Map x:Name="MyMap" Extent="-12948716, 3633316, -11207358, 5196630"
            Background="White" HorizontalAlignment="Left" Margin="12,85,0,0"  
            VerticalAlignment="Top" Height="360" Width="401">
  
    <!-- Add an ArcGISTiledMapServiceLayer for some quick data display. -->
    <esri:ArcGISTiledMapServiceLayer 
          Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" />
  </esri:Map>
  
  <!--
  Add a Bookmark Control. It is important to provide an x:Name attribute so it can be referenced
  in the code-behind. Define the Style of the Bookmark to use the Control Template that was generated
  in Blend and modified here in Visual Studio. The Map Property uses the default two-way Binding to 
  associate the Bookmark Control with the Map Control. The Loaded Event handler was added so that in
  the code-behind some predefined bookmarks could be added.
  -->
  <esri:Bookmark x:Name="MyBookmarks" Width="200" HorizontalAlignment="Right" VerticalAlignment="Top" 
                 Margin="0,85,12,0" Background="#CC919191" BorderBrush="#FF92a8b3" Foreground="Black"   
                 Style="{StaticResource BookmarkStyle1}"
                 Map="{Binding ElementName=MyMap}" Loaded="MyBookmarks_Loaded"/>
      
</Grid>

private void MyBookmarks_Loaded(object sender, System.Windows.RoutedEventArgs e)
{
  // This function clears out any existing bookmarks and added several new ones to provide predefined
  // functionality for zooming around the Four Corners states of the United States.
  
  // Clear out any existing bookmarks. 
  MyBookmarks.ClearBookmarks();
  
  // Add bookmarks for the various areas of the Four Corners region of the United States.
  ESRI.ArcGIS.Client.Geometry.Envelope myExtentTheFourCorners = new ESRI.ArcGIS.Client.Geometry.Envelope(-12948716, 3633316, -11207358, 5196630);
  MyBookmarks.AddBookmark("The Four Corners", myExtentTheFourCorners);
  
  ESRI.ArcGIS.Client.Geometry.Envelope myExtentArizona = new ESRI.ArcGIS.Client.Geometry.Envelope(-12921190, 3642001, -11973117, 4493139);
  MyBookmarks.AddBookmark("Arizona", myExtentArizona);
  
  ESRI.ArcGIS.Client.Geometry.Envelope myExtentColorado = new ESRI.ArcGIS.Client.Geometry.Envelope(-12190630, 4330502, -11325307, 5107351);
  MyBookmarks.AddBookmark("Colorado", myExtentColorado);
  
  ESRI.ArcGIS.Client.Geometry.Envelope myExtentNewMexico = new ESRI.ArcGIS.Client.Geometry.Envelope(-12289052, 3647640, -11371077, 4471758);
  MyBookmarks.AddBookmark("New Mexico", myExtentNewMexico);
  
  ESRI.ArcGIS.Client.Geometry.Envelope myExtentUtah = new ESRI.ArcGIS.Client.Geometry.Envelope(-12850560, 4409389, -11995243, 5177256);
  MyBookmarks.AddBookmark("Utah", myExtentUtah);
 }

Private Sub MyBookmarks_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
  
  ' This function clears out any existing bookmarks and added several new ones to provide predefined
  ' functionality for zooming around the Four Corners states of the United States.
  
  ' Clear out any existing bookmarks. 
  MyBookmarks.ClearBookmarks()
  
  ' Add bookmarks for the various areas of the Four Corners region of the United States.
  Dim myExtentTheFourCorners As New ESRI.ArcGIS.Client.Geometry.Envelope(-12948716, 3633316, -11207358, 5196630)
  MyBookmarks.AddBookmark("The Four Corners", myExtentTheFourCorners)
  
  Dim myExtentArizona As New ESRI.ArcGIS.Client.Geometry.Envelope(-12921190, 3642001, -11973117, 4493139)
  MyBookmarks.AddBookmark("Arizona", myExtentArizona)
  
  Dim myExtentColorado As New ESRI.ArcGIS.Client.Geometry.Envelope(-12190630, 4330502, -11325307, 5107351)
  MyBookmarks.AddBookmark("Colorado", myExtentColorado)
  
  Dim myExtentNewMexico As New ESRI.ArcGIS.Client.Geometry.Envelope(-12289052, 3647640, -11371077, 4471758)
  MyBookmarks.AddBookmark("New Mexico", myExtentNewMexico)
  
  Dim myExtentUtah As New ESRI.ArcGIS.Client.Geometry.Envelope(-12850560, 4409389, -11995243, 5177256)
  MyBookmarks.AddBookmark("Utah", myExtentUtah)
  
End Sub