Public ReadOnly Property Bookmarks As ObservableCollection(Of Bookmark.MapBookmark)

public ObservableCollection<Bookmark.MapBookmark> Bookmarks {get;}

<Grid x:Name="LayoutRoot">
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="52" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="626" 
           TextWrapping="Wrap" Margin="2,9,0,0" 
           Text="Click the different RadioButtons to change the items in the Bookmark Control. Then click the
                various Bookmark.MapBookmark items in the Bookmark Control to zoom to the different Extents." />
  
  <!-- Add a Map Control. -->
  <esri:Map Background="White" HorizontalAlignment="Left" Margin="12,85,0,0" Name="Map1" 
            VerticalAlignment="Top" Height="360" Width="401" >
        
    <!-- Add an ArcGISTiledMapServiceLayer for a data source. -->
    <esri:ArcGISTiledMapServiceLayer ID="PhysicalTiledLayer" 
                 Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
  </esri:Map>
  
  <!-- Add a Bookmark Control. Bind the Bookmark.Map Property to the Map Control. -->
  <esri:Bookmark HorizontalAlignment="Left" Margin="426,85,0,0" Name="Bookmark1" 
                 VerticalAlignment="Top" Width="179" 
                 Map="{Binding ElementName=Map1}"/>
      
  <!-- 
  Add a RadioButton that will correspond to State level predefined Map.Extents. The Click Event is
  Wired-up for use with the code-behind. Note how it uses the same Event handler as the other
  Radio Buttons. It is the use of the RadioButton.Tag Property that will help the code-behind
  functions know which RadioButton was chosen.
  -->
  <RadioButton Content="State (FL and GA)" Height="16" HorizontalAlignment="Left" Margin="12,67,0,0"
               Name="RadioButton_State" VerticalAlignment="Top" Click="RadioButtons"
               Tag="State"/>
  
  <!-- 
  Add a RadioButton that will correspond to local level predefined Map.Extents. The Click Event is
  Wired-up for use with the code-behind. Note how it uses the same Event handler as the other
  Radio Buttons. It is the use of the RadioButton.Tag Property that will help the code-behind
  functions know which RadioButton was chosen.
  -->
  <RadioButton Content="Florida (local)" Height="16" HorizontalAlignment="Left" Margin="154,67,0,0" 
               Name="RadioButton_Local_FL" VerticalAlignment="Top" Click="RadioButtons" 
               Tag="FL"/>
  
  <!-- 
  Add a RadioButton that will correspond to local level predefined Map.Extents. The Click Event is
  Wired-up for use with the code-behind. Note how it uses the same Event handler as the other
  Radio Buttons. It is the use of the RadioButton.Tag Property that will help the code-behind
  functions know which RadioButton was chosen.
  -->
  <RadioButton Content="Georgia (local)" Height="16" HorizontalAlignment="Left" Margin="288,67,0,0" 
               Name="RadioButton_Local_GA" VerticalAlignment="Top" Click="RadioButtons"
               Tag="GA"/>
  
</Grid>

private void RadioButtons(object sender, System.Windows.RoutedEventArgs e)
{
  // This function serves as the Click Event handler for the three RadioButtons. Get the .Tag 
  // Property from the RadioButton to construct an ObservableCollecton of MapBookmark objects. 
  // Then add the MapBookmark items to the Bookmark Control.
  
  // Get the RadioButton from the sender.
  RadioButton theRadioButton = (RadioButton)sender;
  
  // Get the String identifying which RadioButton we have from the RadioButton.Tag Property.
  string theTag = (string)theRadioButton.Tag;
  
  // Get the ObservableCollection<Of MapBookmark> object based upon which RadioButton the user chose.
  Collections.ObjectModel.ObservableCollection<ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark> myObservableCollectionOfMapBookmark = null;
  myObservableCollectionOfMapBookmark = GenerateObservableCollectionOfMapBookmark(theTag);
  
  // Clear out any existing MapBookmark objects from the Bookmark Control.
  Bookmark1.ClearBookmarks();
  
  // Loop through the ObservableCollection<MapBookmark> object and add each MapBookmark to 
  // the Bookmark Control using the .Bookmarks Property.
  foreach (ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark oneMapBookmark in myObservableCollectionOfMapBookmark)
  {
    // The Bookmark.Bookmarks Property returns a ReadOnly ObservableCollection<MapBookmark> 
    // object. So to get items in the ObservableCollection, use the Add Property.
    Bookmark1.Bookmarks.Add(oneMapBookmark);
  
    // This could be an alternative way to add a MapBookmark to the ObservableCollection!
    // Bookmark1.AddBookmark(oneMapBookmark.Name, oneMapBookmark.Extent);
  }
  
  // NOTE: Because the Bookmark.Bookmarks Property returns a Read Only 
  // ObservableCollection<MapBookmark>, you CANNOT do this:
  // Bookmark1.Bookmarks = myObservableCollectionOfMapBookmark;
}
            
public Collections.ObjectModel.ObservableCollection<ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark> GenerateObservableCollectionOfMapBookmark(string theTag)
{
  // This the main function that generates the correct set of MapBookmark items to be added to the
  // Bookmark Control. Depending on which RadioButton the user chose will determine what gets added to
  // the ObservableCollection<MapBookmark>.
  
  // Create a new instance of the ObservableCollection<MapBookmark>.
  Collections.ObjectModel.ObservableCollection<ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark> theBookmarks = new Collections.ObjectModel.ObservableCollection<ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark>();
  
  if (theTag == "State")
  {
    // Generate MapBookmark's for a State level of viewing.
    theBookmarks.Add(MakeMapBookmark("Florida and Georgia", new ESRI.ArcGIS.Client.Geometry.Envelope(-10126037, 2750924, -8487426, 4221996)));
    theBookmarks.Add(MakeMapBookmark("Florida", new ESRI.ArcGIS.Client.Geometry.Envelope(-9808676, 2779124, -8812475, 3673469)));
    theBookmarks.Add(MakeMapBookmark("Georgia", new ESRI.ArcGIS.Client.Geometry.Envelope(-9633752, 3534963, -8898290, 4195229)));
  }
  else if (theTag == "FL")
  {
    // Generate MapBookmark's for a local level of viewing.
    theBookmarks.Add(MakeMapBookmark("Jacksonville", new ESRI.ArcGIS.Client.Geometry.Envelope(-9105796, 3532477, -9075555, 3559626)));
    theBookmarks.Add(MakeMapBookmark("Miami", new ESRI.ArcGIS.Client.Geometry.Envelope(-8936736, 2965084, -8918792, 2981193)));
    theBookmarks.Add(MakeMapBookmark("Tampa", new ESRI.ArcGIS.Client.Geometry.Envelope(-9194994, 3225279, -9165864, 3251430)));
  }
  else if (theTag == "GA")
  {
    // Generate MapBookmark's for a local level of viewing.
    theBookmarks.Add(MakeMapBookmark("Atlanta", new ESRI.ArcGIS.Client.Geometry.Envelope(-9421000, 3975108, -9367812, 4022858)));
    theBookmarks.Add(MakeMapBookmark("Columbus", new ESRI.ArcGIS.Client.Geometry.Envelope(-9464616, 3820843, -9455555, 3828978)));
    theBookmarks.Add(MakeMapBookmark("Savannah", new ESRI.ArcGIS.Client.Geometry.Envelope(-9043472, 3757220, -9013688, 3783958)));
  }
  
  // Return the ObservableCollection<MapBookmark> to the caller.
  return theBookmarks;
}
            
public ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark MakeMapBookmark(string aName, ESRI.ArcGIS.Client.Geometry.Envelope anExtent)
{
  // A helper function to create a single MapBookmark based upon an input Name and Extent.
  ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark aMapBookmark = new ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark();
  aMapBookmark.Name = aName;
  aMapBookmark.Extent = anExtent;
  
  // Return the MapBookmark to the caller.
  return aMapBookmark;
}

Private Sub RadioButtons(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
  
  ' This function serves as the Click Event handler for the three RadioButtons. Get the .Tag 
  ' Property from the RadioButton to construct an ObservableCollecton of MapBookmark objects. 
  ' Then add the MapBookmark items to the Bookmark Control.
  
  ' Get the RadioButton from the sender.
  Dim theRadioButton As RadioButton = sender
  
  ' Get the String identifying which RadioButton we have from the RadioButton.Tag Property.
  Dim theTag As String = theRadioButton.Tag
  
  ' Get the ObservableCollection(Of MapBookmark) object based upon which RadioButton the user chose.
  Dim myObservableCollectionOfMapBookmark As Collections.ObjectModel.ObservableCollection(Of ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark)
  myObservableCollectionOfMapBookmark = GenerateObservableCollectionOfMapBookmark(theTag)
  
  ' Clear out any existing MapBookmark objects from the Bookmark Control.
  Bookmark1.ClearBookmarks()
  
  ' Loop through the ObservableCollection(Of MapBookmark) object and add each MapBookmark to 
  ' the Bookmark Control using the .Bookmarks Property.
  For Each oneMapBookmark As ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark In myObservableCollectionOfMapBookmark
  
    ' The Bookmark.Bookmarks Property returns a ReadOnly ObservableCollection(Of MapBookmark) 
    ' object. So to get items in the ObservableCollection, use the Add Property.
    Bookmark1.Bookmarks.Add(oneMapBookmark)
    
    ' This could be an alternative way to add a MapBookmark to the ObservableCollection!
    'Bookmark1.AddBookmark(oneMapBookmark.Name, oneMapBookmark.Extent)
    
  Next
  
  ' NOTE: Because the Bookmark.Bookmarks Property returns a Read Only 
  ' ObservableCollection(Of MapBookmark), you CANNOT do this:
  'Bookmark1.Bookmarks = myObservableCollectionOfMapBookmark
  
End Sub
            
Public Function GenerateObservableCollectionOfMapBookmark(ByVal theTag As String) As Collections.ObjectModel.ObservableCollection(Of ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark)
  
  ' This the main function that generates the correct set of MapBookmark items to be added to the
  ' Bookmark Control. Depending on which RadioButton the user chose will determine what gets added to
  ' the ObservableCollection(Of MapBookmark).
  
  ' Create a new instance of the ObservableCollection(Of MapBookmark).
  Dim theBookmarks As New Collections.ObjectModel.ObservableCollection(Of ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark)
  
  If theTag = "State" Then
    
    ' Generate MapBookmark's for a State level of viewing.
    theBookmarks.Add(MakeMapBookmark("Florida and Georgia", New ESRI.ArcGIS.Client.Geometry.Envelope(-10126037, 2750924, -8487426, 4221996)))
    theBookmarks.Add(MakeMapBookmark("Florida", New ESRI.ArcGIS.Client.Geometry.Envelope(-9808676, 2779124, -8812475, 3673469)))
    theBookmarks.Add(MakeMapBookmark("Georgia", New ESRI.ArcGIS.Client.Geometry.Envelope(-9633752, 3534963, -8898290, 4195229)))
    
  ElseIf theTag = "FL" Then
    
    ' Generate MapBookmark's for a local level of viewing.
    theBookmarks.Add(MakeMapBookmark("Jacksonville", New ESRI.ArcGIS.Client.Geometry.Envelope(-9105796, 3532477, -9075555, 3559626)))
    theBookmarks.Add(MakeMapBookmark("Miami", New ESRI.ArcGIS.Client.Geometry.Envelope(-8936736, 2965084, -8918792, 2981193)))
    theBookmarks.Add(MakeMapBookmark("Tampa", New ESRI.ArcGIS.Client.Geometry.Envelope(-9194994, 3225279, -9165864, 3251430)))
    
  ElseIf theTag = "GA" Then
    
    ' Generate MapBookmark's for a local level of viewing.
    theBookmarks.Add(MakeMapBookmark("Atlanta", New ESRI.ArcGIS.Client.Geometry.Envelope(-9421000, 3975108, -9367812, 4022858)))
    theBookmarks.Add(MakeMapBookmark("Columbus", New ESRI.ArcGIS.Client.Geometry.Envelope(-9464616, 3820843, -9455555, 3828978)))
    theBookmarks.Add(MakeMapBookmark("Savannah", New ESRI.ArcGIS.Client.Geometry.Envelope(-9043472, 3757220, -9013688, 3783958)))
    
  End If
  
  ' Return the ObservableCollection(Of MapBookmark) to the caller.
  Return theBookmarks
  
End Function
            
Public Function MakeMapBookmark(ByVal aName As String, ByVal anExtent As ESRI.ArcGIS.Client.Geometry.Envelope) As ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark
  
  ' A helper function to create a single MapBookmark based upon an input Name and Extent.
  Dim aMapBookmark As New ESRI.ArcGIS.Client.Toolkit.Bookmark.MapBookmark
  aMapBookmark.Name = aName
  aMapBookmark.Extent = anExtent
  
  ' Return the MapBookmark to the caller.
  Return aMapBookmark
  
End Function