Public Property Rotation As Double

public double Rotation {get; set;}

<Grid x:Name="LayoutRoot" Background="White">
  
  <!--
  Bind the Value from the Slider to the Map's RotationProperty.
  This will update the Map's Rotation value automatically as the Slider moves.
  
  Set the initial Extent of the Map (the African Continent).
  -->
  <esri:Map Name="Map1" Background="White" Height="300" Width="300" Margin="50,85,0,0"  
        HorizontalAlignment="left" VerticalAlignment="Top" 
        Rotation="{Binding ElementName=Slider1, Path=Value}" Extent="-34.45,-46.05,71.01,59.41">
    
    <!--
    Create a circle geometric object and use it to Clip the viewable extent of the Map control.
    -->
    <esri:Map.Clip>
      <EllipseGeometry Center="150,150" RadiusX="150" RadiusY="150"/>
    </esri:Map.Clip>
    
    <!--
    Add an ArcGISTiledMapsServiceLayer to the Map.
    -->
    <esri:ArcGISTiledMapServiceLayer 
          Url="http://services.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"/>
            
  </esri:Map>
          
  <!--
  Define the Slider's Minimum and Maximum values. 
  This will define the upper and lower constraints for the Map's Rotation.
  -->
  <Slider Name="Slider1" Height="23" Width="300" Margin="50,61,0,0"  
          HorizontalAlignment="Left" VerticalAlignment="Top"  
          Minimum="-360" Maximum="360"/>
          
  <sdk:Label Name="Label1" Content="Rotation:" Height="28" Margin="49,38,0,0" 
             HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="24" FontFamily="Arial" />
          
  <!--
  Bind the Value from the Slider to the TextBlock's TextProperty.
  This will update the TextBlocks Text value automatically as the Slider moves.
  -->
  <TextBlock Name="TextBlock1" Text="{Binding ElementName=Slider1, Path=Value}" Height="23" Margin="195,39,0,0"  
             HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="24" FontFamily="Arial" />
  
</Grid>

private void MainPage_Loaded(object sender, System.Windows.RoutedEventArgs e)
{
  
  // The following controls were pre-defined in the XAML:
  // ----------------------------------------------------
  //
  //<esri:Map Name="Map1" Background="White" Height="300" Width="300" Margin="50,85,0,0"  
  //          HorizontalAlignment="left" VerticalAlignment="Top" />
  //<Slider Name="Slider1" Height="23" Width="300" Margin="50,61,0,0"  
  //        HorizontalAlignment="Left" VerticalAlignment="Top"  />
  //<sdk:Label Name="Label1" Content="Rotation:" Height="28" Margin="49,38,0,0" 
  //           HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="24" FontFamily="Arial" />
  //<TextBlock Name="TextBlock1" Text="0" Height="23" Margin="195,39,0,0"  
  //           HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="24" FontFamily="Arial" />
  
  // Clear out any existing layers.
  Map1.Layers.Clear();
  
  // Add an ArcGISTiledMapsServiceLayer to the Map.
  ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer myArcGISTiledMapServiceLayer = new ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer();
  myArcGISTiledMapServiceLayer.Url = "http://services.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer";
  Map1.Layers.Add(myArcGISTiledMapServiceLayer);
  
  // Set the initial Extent of the Map (the African Continent).
  ESRI.ArcGIS.Client.Geometry.Envelope myEnvelope = new ESRI.ArcGIS.Client.Geometry.Envelope();
  myEnvelope.XMin = -34.45;
  myEnvelope.YMin = -46.05;
  myEnvelope.XMax = 71.01;
  myEnvelope.YMax = 59.41;
  Map1.Extent = myEnvelope;
  
  // Create a circle geometric object and use it to Clip the viewable extent of the Map control.
  System.Windows.Media.EllipseGeometry myEllipse = new System.Windows.Media.EllipseGeometry();
  myEllipse.Center = new System.Windows.Point(150, 150);
  myEllipse.RadiusX = 150;
  myEllipse.RadiusY = 150;
  Map1.Clip = myEllipse;
  
  // Define the Slider's Minimum and Maximum values. 
  // This will define the upper and lower constraints for the Map's Rotation.
  Slider1.Minimum = -360;
  Slider1.Maximum = 360;
  
  // Bind the Value from the Slider to the Map's RotationProperty.
  // This will update the Map's Rotation value automatically as the Slider moves.
  System.Windows.Data.Binding myBinding2 = new System.Windows.Data.Binding("Value");
  myBinding2.Mode = System.Windows.Data.BindingMode.OneWay;
  myBinding2.ElementName = "Slider1";
  Map1.SetBinding(ESRI.ArcGIS.Client.Map.RotationProperty, myBinding2);
  
  // Bind the Value from the Slider to the TextBlock's TextProperty.
  // This will update the TextBlocks Text value automatically as the Slider moves.
  System.Windows.Data.Binding myBinding3 = new System.Windows.Data.Binding("Value");
  myBinding3.Mode = System.Windows.Data.BindingMode.OneWay;
  myBinding3.ElementName = "Slider1";
  TextBlock1.SetBinding(TextBlock.TextProperty, myBinding3);
  
}

Private Sub MainPage_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
  
  ' The following controls were pre-defined in the XAML:
  ' ----------------------------------------------------
  '
  '<esri:Map Name="Map1" Background="White" Height="300" Width="300" Margin="50,85,0,0"  
  '        ///     HorizontalAlignment="left" VerticalAlignment="Top" />
  '<Slider Name="Slider1" Height="23" Width="300" Margin="50,61,0,0"  
  '        ///   HorizontalAlignment="Left" VerticalAlignment="Top"  />
  '<sdk:Label Name="Label1" Content="Rotation:" Height="28" Margin="49,38,0,0" 
  '        ///      HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="24" FontFamily="Arial" />
  '<TextBlock Name="TextBlock1" Text="0" Height="23" Margin="195,39,0,0"  
  '        ///      HorizontalAlignment="Left" VerticalAlignment="Top" FontSize="24" FontFamily="Arial" />
  
  ' Clear out any existing layers.
  Map1.Layers.Clear()
  
  ' Add an ArcGISTiledMapsServiceLayer to the Map.
  Dim myArcGISTiledMapServiceLayer As New ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer
  myArcGISTiledMapServiceLayer.Url = "http://services.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"
  Map1.Layers.Add(myArcGISTiledMapServiceLayer)
  
  ' Set the initial Extent of the Map (the African Continent).
  Dim myEnvelope As New ESRI.ArcGIS.Client.Geometry.Envelope
  myEnvelope.XMin = -34.45
  myEnvelope.YMin = -46.05
  myEnvelope.XMax = 71.01
  myEnvelope.YMax = 59.41
  Map1.Extent = myEnvelope
  
  ' Create a circle geometric object and use it to Clip the viewable extent of the Map control.
  Dim myEllipse As New System.Windows.Media.EllipseGeometry
  myEllipse.Center = New System.Windows.Point(150, 150)
  myEllipse.RadiusX = 150
  myEllipse.RadiusY = 150
  Map1.Clip = myEllipse
  
  ' Define the Slider's Minimum and Maximum values. 
  ' This will define the upper and lower constraints for the Map's Rotation.
  Slider1.Minimum = -360
  Slider1.Maximum = 360
  
  ' Bind the Value from the Slider to the Map's RotationProperty.
  ' This will update the Map's Rotation value automatically as the Slider moves.
  Dim myBinding2 As System.Windows.Data.Binding = New System.Windows.Data.Binding("Value")
  myBinding2.Mode = System.Windows.Data.BindingMode.OneWay
  myBinding2.ElementName = "Slider1"
  Map1.SetBinding(ESRI.ArcGIS.Client.Map.RotationProperty, myBinding2)
  
  ' Bind the Value from the Slider to the TextBlock's TextProperty.
  ' This will update the TextBlocks Text value automatically as the Slider moves.
  Dim myBinding3 As System.Windows.Data.Binding = New System.Windows.Data.Binding("Value")
  myBinding3.Mode = System.Windows.Data.BindingMode.OneWay
  myBinding3.ElementName = "Slider1"
  TextBlock1.SetBinding(TextBlock.TextProperty, myBinding3)
  
End Sub