Public Property Symbol As Symbol

public Symbol Symbol {get; set;}

<Grid x:Name="LayoutRoot">
  
  <!-- Define two SimpleMarkerSymbol's and a SpatialReference in the Resources section of the XAML file. -->
  <Grid.Resources>
  
    <!-- Tip: Use x:Key Attribute and not x:Name Attribute for defining the name of the Resources so that
         you can access the Resource in the code-behind file. -->
  
    <!-- The 'RedMarkerSymbol' will be used as the default symbol for the Graphics. -->
    <esri:SimpleMarkerSymbol x:Key="RedMarkerSymbol" Color="Red" Size="12" Style="Circle" />
    
    <!-- The 'SelectedMarkerSymbol' will be used in the code-behind file to change the symbology
         for the Selected Graphics. -->
    <esri:SimpleMarkerSymbol x:Key="SelectedMarkerSymbol" Color="Black" Size="14" Style="Diamond" />
    
    <!-- Define a SpatialReference object that has the same WKID as the ArcGISTiledMapServiceLayer in
         the Map. This will allow for the Graphics in the GraphicsLayer to line up properly. -->
    <esri:SpatialReference x:Key="theSpatialReference" WKID="102100"/>
    
  </Grid.Resources>
  
  <!-- Add a Map control with an ArcGISTiledMapServiceLayer and a GraphicsLayer. The GraphicsLayer will
       contain several Graphics based upon MapPoint geometries (which use the defined SpatialReference) 
       and using the RedMarkerSymbol as the default symbolization. -->
  <esri:Map Background="White" HorizontalAlignment="Left" Margin="12,108,0,0" Name="Map1" 
            VerticalAlignment="Top" Height="318" Width="483" >
        
    <esri:ArcGISTiledMapServiceLayer ID="PhysicalTiledLayer" 
                   Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer" />
          
    <!-- It is important to provide the GraphicsLayer with an 'ID' Attribute so to be able to access it
         in the code-behind file. -->
    <esri:GraphicsLayer ID="MyGraphicsLayer" >
        
      <esri:GraphicsLayer.Graphics>
            
        <!-- Each Graphic added to the GraphicsLayer will have it's symbology and geometry defined. -->
                  
        <esri:Graphic Symbol="{StaticResource RedMarkerSymbol}" >
          <esri:MapPoint X="-7356594.25" Y="4752385.95" SpatialReference="{StaticResource theSpatialReference}"/>
        </esri:Graphic>
        
        <esri:Graphic Symbol="{StaticResource RedMarkerSymbol}" >
          <esri:MapPoint X="3654893.89" Y="7718746.02" SpatialReference="{StaticResource theSpatialReference}"/>
        </esri:Graphic>
        
        <esri:Graphic Symbol="{StaticResource RedMarkerSymbol}" >
          <esri:MapPoint X="6801033.36" Y="10325547.30" SpatialReference="{StaticResource theSpatialReference}"/>
        </esri:Graphic>
        
        <esri:Graphic Symbol="{StaticResource RedMarkerSymbol}" >
          <esri:MapPoint X="-5468910.57" Y="1741081.03" SpatialReference="{StaticResource theSpatialReference}"/>
        </esri:Graphic>
        
        <esri:Graphic Symbol="{StaticResource RedMarkerSymbol}" >
          <esri:MapPoint X="-4614958.43" Y="-326382.05" SpatialReference="{StaticResource theSpatialReference}"/>
        </esri:Graphic>
        
      </esri:GraphicsLayer.Graphics>
          
    </esri:GraphicsLayer>
    
  </esri:Map>
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="40" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" 
             Width="483" TextWrapping="Wrap" Margin="12,12,0,0" 
             Text="Click the button to select every other Graphic and then change the Symbol of the 
             selected Graphics to one that was defined in XAML." />
    
  <!-- Add a button to perform the work. -->
  <Button Content="Select every other Graphic and change its Symbology" Height="23" HorizontalAlignment="Left" 
          Margin="91,79,0,0" Name="Button1" VerticalAlignment="Top" Width="335" Click="Button1_Click"/>
  
</Grid>

private void Button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
  // Obtain the GraphicsLayer that was defined in XAML. 
  ESRI.ArcGIS.Client.GraphicsLayer theGraphicsLayer = null;
  theGraphicsLayer = (ESRI.ArcGIS.Client.GraphicsLayer)(Map1.Layers["MyGraphicsLayer"]);
  
  // Get the GraphicCollection from the GraphicsLayer
  ESRI.ArcGIS.Client.GraphicCollection theGraphicsCollection = theGraphicsLayer.Graphics;
  
  // Call a function to select every other Graphic
  SelectEveryOtherGraphic(theGraphicsCollection);
  
  // Call a function to change the Symbology of the selected Graphics
  RenderSelectedGraphicsDifferently(theGraphicsCollection);
}
            
public void SelectEveryOtherGraphic(ESRI.ArcGIS.Client.GraphicCollection theGraphicsCollection)
{
  // Select every other Graphic in the GraphicsCollection
  for (int i = 0; i < theGraphicsCollection.Count; i += 2)
    theGraphicsCollection(i).Selected = true;
}
            
public void RenderSelectedGraphicsDifferently(ESRI.ArcGIS.Client.GraphicCollection theGraphicsCollection)
{
  // Render the Selected Graphics in the GraphicsCollection with a different Symbol that was defined in XAML.
  
  // Obtain the SimpleMarkerSymbol that was defined in XAML.
  ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol theSelectedMarkerSymbol = null;
  theSelectedMarkerSymbol = (ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol)(LayoutRoot.Resources["SelectedMarkerSymbol"]);
  
  // Loop through all of the individual Graphic objects in the GraphicsCollection
  foreach (ESRI.ArcGIS.Client.Graphic aGraphic in theGraphicsCollection)
  {
    // If the Graphic was Selected then change its symbology.
    if (aGraphic.Selected == true)
    {
      aGraphic.Symbol = (ESRI.ArcGIS.Client.Symbols.Symbol)theSelectedMarkerSymbol;
    }
  }
}

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
  
  ' Obtain the GraphicsLayer that was defined in XAML. 
  Dim theGraphicsLayer As ESRI.ArcGIS.Client.GraphicsLayer
  theGraphicsLayer = CType(Map1.Layers("MyGraphicsLayer"), ESRI.ArcGIS.Client.GraphicsLayer)
  
  ' Get the GraphicCollection from the GraphicsLayer
  Dim theGraphicsCollection As ESRI.ArcGIS.Client.GraphicCollection = theGraphicsLayer.Graphics
  
  ' Call a function to select every other Graphic
  SelectEveryOtherGraphic(theGraphicsCollection)
  
  ' Call a function to change the Symbology of the selected Graphics
  RenderSelectedGraphicsDifferently(theGraphicsCollection)
  
End Sub
  
Public Sub SelectEveryOtherGraphic(ByVal theGraphicsCollection As ESRI.ArcGIS.Client.GraphicCollection)
  
  ' Select every other Graphic in the GraphicsCollection
  For i As Integer = 0 To theGraphicsCollection.Count - 1 Step 2
    theGraphicsCollection(i).Selected = True
  Next i
  
End Sub
            
Public Sub RenderSelectedGraphicsDifferently(ByVal theGraphicsCollection As ESRI.ArcGIS.Client.GraphicCollection)
  
  ' Render the Selected Graphics in the GraphicsCollection with a different Symbol that was defined in XAML.
  
  ' Obtain the SimpleMarkerSymbol that was defined in XAML.
  Dim theSelectedMarkerSymbol As ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol
  theSelectedMarkerSymbol = CType(LayoutRoot.Resources("SelectedMarkerSymbol"), ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol)
  
  ' Loop through all of the individual Graphic objects in the GraphicsCollection
  Dim aGraphic As ESRI.ArcGIS.Client.Graphic
  For Each aGraphic In theGraphicsCollection
    
    ' If the Graphic was Selected then change its symbology.
    If aGraphic.Selected = True Then
      aGraphic.Symbol = CType(theSelectedMarkerSymbol, ESRI.ArcGIS.Client.Symbols.Symbol)
    End If
    
  Next
  
End Sub