Public Overloads Function FindGraphicsInHostCoordinates( _
   ByVal intersectingPoint As Point _
) As IEnumerable(Of Graphic)

public IEnumerable<Graphic> FindGraphicsInHostCoordinates( 
   Point intersectingPoint
)

<Grid x:Name="LayoutRoot">
  
  <!-- Define some Resources that can be used in other parts of the XAML file. -->
  <Grid.Resources>
    
    <!-- 
    Define three SimpleFillSymbols to use as the initial display of the Graphics on the Map. 
    NOTE: The .Fill Property is using the Color format of "#aarrggbb" where:
    aa = alpha hexadecimal value (i.e. Transparency)
    rr = red hexadecimal value 
    gg = green hexadecimal value
    bb = blue red hexadecimal value 
    -->
    <esri:SimpleFillSymbol x:Key="RedFillSymbol" Fill="#66FF0000" BorderBrush="Red" BorderThickness="2" />
    <esri:SimpleFillSymbol x:Key="GreenFillSymbol" Fill="#6600FF00" BorderBrush="Green" BorderThickness="2" />
    <esri:SimpleFillSymbol x:Key="BlueFillSymbol" Fill="#660000FF" BorderBrush="Blue" BorderThickness="2" />
    
    <!-- 
    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. -->
  <esri:Map Background="White" HorizontalAlignment="Left" Margin="0,100,0,0" Name="Map1" 
        VerticalAlignment="Top" Height="318" Width="483" Extent="-9304835,-3059995,3592606,5431487">
    <esri:ArcGISTiledMapServiceLayer ID="PhysicalTiledLayer" 
          Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_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. Wire up an Event Handler for the Left Mouse Button Down when the user 
    clicks on one or more Graphics. If the user clicks in the Map Control but not directly over a 
    Graphic, the Left Mouse Button Down Event will not fire.
    -->
    <esri:GraphicsLayer ID="MyGraphicsLayer" MouseLeftButtonDown="GraphicsLayer_MouseLeftButtonDown">
      
      <esri:GraphicsLayer.Graphics>
        
        <!-- 
        Define several Polygon based Graphics using the StaticResources for the Symbol and SpatialReference. 
        NOTE: The individual Graphics will have some parts that overlap in the same geographic space. Because 
        a Transparency value (i.e. Alpha) was used in defining the Symbol of the Graphics, the user should be
        able to visually see where they overlap. 
        -->
        <esri:Graphic Symbol="{StaticResource RedFillSymbol}">
          <esri:Polygon SpatialReference="{StaticResource theSpatialReference}">
            <esri:Polygon.Rings>
              <esri:PointCollection>
                <esri:MapPoint X="-7474807" Y="1994328" />
                <esri:MapPoint X="-3831623" Y="4224208" />
                <esri:MapPoint X="-1350490" Y="581024" />
                <esri:MapPoint X="-5087893" Y="-1429007" />
                <esri:MapPoint X="-7474807" Y="1994328" />
              </esri:PointCollection>
            </esri:Polygon.Rings>
          </esri:Polygon>
        </esri:Graphic>
                
        <esri:Graphic Symbol="{StaticResource GreenFillSymbol}">
          <esri:Polygon SpatialReference="{StaticResource theSpatialReference}">
            <esri:Polygon.Rings>
              <esri:PointCollection>
                <esri:MapPoint X="-3768810" Y="1240566" />
                <esri:MapPoint X="-125627" Y="3533259" />
                <esri:MapPoint X="1633151" Y="675245" />
                <esri:MapPoint X="-1947218" Y="-1491820" />
                <esri:MapPoint X="-3768810" Y="1240566" />
              </esri:PointCollection>
            </esri:Polygon.Rings>
          </esri:Polygon>
        </esri:Graphic>
        
        <esri:Graphic Symbol="{StaticResource BlueFillSymbol}">
          <esri:Polygon SpatialReference="{StaticResource theSpatialReference}">
            <esri:Polygon.Rings>
              <esri:PointCollection>
                <esri:MapPoint X="-7663247" Y="1334786" />
                <esri:MapPoint X="2324099" Y="1774481" />
                <esri:MapPoint X="2449726" Y="204143" />
                <esri:MapPoint X="-7631840" Y="-518211" />
                <esri:MapPoint X="-7663247" Y="1334786" />
              </esri:PointCollection>
            </esri:Polygon.Rings>
          </esri:Polygon>
        </esri:Graphic>
        
      </esri:GraphicsLayer.Graphics>
    </esri:GraphicsLayer>
        
  </esri:Map>
  
  <!-- Display back to the user where they clicked with the Mouse over the Graphic(s) in the Map Control. -->
  <sdk:Label Height="18" HorizontalAlignment="Left" Margin="12,435,0,0" Name="Label_MapPixelCoordinate" 
       VerticalAlignment="Top" Width="335" Content="Pixel coordinate location of the Mouse click over a Graphic:"/>
  <sdk:Label Height="28" Margin="12,451,770,0" Name="Label_MapX" 
       VerticalAlignment="Top" Content="X: "/>
  <TextBlock Height="23" HorizontalAlignment="Left" Margin="26,451,0,0" Name="TextBlock_MapX" 
             VerticalAlignment="Top" />
  <sdk:Label Height="28" HorizontalAlignment="Left" Margin="58,451,0,0" Name="Label_MapY" 
       VerticalAlignment="Top" Width="19" Content="Y: "/>
  <TextBlock Height="23" HorizontalAlignment="Left" Margin="74,451,0,0" Name="TextBlock_MapY" 
             VerticalAlignment="Top" />
  
  <!-- Display back to the user where they clicked with the Mouse over the Graphic(s) in the Application space. -->
  <sdk:Label Height="19" HorizontalAlignment="Left" Margin="12,485,0,0" Name="Label_ApplicationPixelCoordinate" VerticalAlignment="Top" 
       Width="436" Content="Pixel coordinate location of the Mouse click in the Application Container:"/>
  <sdk:Label Height="28" HorizontalAlignment="Left" Margin="12,503,0,0" Name="Label_ApplicationX" 
       VerticalAlignment="Top" Width="18" Content="X: "/>
  <TextBlock Height="23" HorizontalAlignment="Left" Margin="27,503,0,0" Name="TextBlock_ApplicationX" 
             VerticalAlignment="Top" />
  <sdk:Label Height="28" HorizontalAlignment="Left" Margin="58,503,0,0" Name="Label_ApplicationY" 
       VerticalAlignment="Top" Width="19" Content="Y: "/>
  <TextBlock Height="23" HorizontalAlignment="Left" Margin="74,503,0,0" Name="TextBlock_ApplicationY" 
             VerticalAlignment="Top" />
  
  <!-- Display back to the user the number of Graphics found by the Mouse click in the Map Control. -->
  <sdk:Label Height="28" HorizontalAlignment="Left" Margin="12,537,0,0" Name="Label_NumberGraphicsSelected" 
       VerticalAlignment="Top" Width="168" Content="Number of Graphics Selected:"/>
  <TextBlock Height="23" HorizontalAlignment="Left" Margin="180,537,0,0" Name="TextBlock_NumberGraphicsSelected" 
             VerticalAlignment="Top" />
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="94" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" 
  Width="659" TextWrapping="Wrap" 
  Text="Click with the Mouse over some of the Graphics in the Map Control to see how many are found using the 
  GraphicsLayer.FindGraphicsinHostCoordinates Method. The pixel coordinate values for the Mouse click will 
  be displayed for the Map Control and the Application container (i.e. the Internet browser) as well as the 
  number of Graphics found at that location. NOTE: The individual Graphics will have some parts that overlap 
  in the same geographic space. Because a Transparency value (i.e. Alpha) was used in defining the Symbol of 
  the Graphics, you should be able to visually see where they overlap to visually check the results. " />
</Grid>

private void GraphicsLayer_MouseLeftButtonDown(object sender, ESRI.ArcGIS.Client.GraphicMouseButtonEventArgs e)
{
  // NOTE: This function only occurs as a result of a Mouse click on a Graphic in the GraphicsLayer. If the user clicks
  // in the Map in an area where no Graphics occur, then this function in will not fire.
  
  // Set this to ensure that other Map actions like pan or zoom do not occur while trying to get a count of the graphics.
  e.Handled = true;
  
  // Get the GraphicsLayer in the Map.
  ESRI.ArcGIS.Client.GraphicsLayer theGraphicsLayer = Map1.Layers["MyGraphicsLayer"] as ESRI.ArcGIS.Client.GraphicsLayer;
  
  // Get the X and Y pixel coordinates of the mouse pointer of the Map Control (which is a System.Windows.UIElement).
  System.Windows.Point theScreenPoint = e.GetPosition(Map1);
  
  // Create a GeneralTransform object to account for difference between pixel coordinates in the Map Control (i.e. theScreenPoint)
  // and the pixel coordinates of the Application (i.e. theTransformScreenPoint).
  System.Windows.Media.GeneralTransform theGeneralTransform = Map1.TransformToVisual(Application.Current.RootVisual);
  
  // Get the X and Y pixel coordinates of the mouse pointer of the Application container (which is a page in the Internet browser).
  System.Windows.Point theTransformScreenPoint = theGeneralTransform.Transform(theScreenPoint);
  
  // Get the collection of Graphic objects that are found where the user clicked with the Mouse in the Map Control. 
  IEnumerable<ESRI.ArcGIS.Client.Graphic> theIEnumerbleOfGraphic = theGraphicsLayer.FindGraphicsInHostCoordinates(theTransformScreenPoint);
  
  // Display back to the user the screen coordinate pixel values of the Map Control where the Mouse was clicked.
  TextBlock_MapX.Text = theScreenPoint.X.ToString();
  TextBlock_MapY.Text = theScreenPoint.Y.ToString();
  
  // Display back to the user the screen coordinate pixel values of the Application container where the Mouse was clicked.
  TextBlock_ApplicationX.Text = theTransformScreenPoint.X.ToString();
  TextBlock_ApplicationY.Text = theTransformScreenPoint.Y.ToString();
  
  // Display back to the user the number of Graphics found at the location where the Mouse was clicked.
  TextBlock_NumberGraphicsSelected.Text = theIEnumerbleOfGraphic.Count().ToString();
}

Private Sub GraphicsLayer_MouseLeftButtonDown(sender As System.Object, e As ESRI.ArcGIS.Client.GraphicMouseButtonEventArgs)
  
  ' NOTE: This function only occurs as a result of a Mouse click on a Graphic in the GraphicsLayer. If the user clicks
  ' in the Map in an area where no Graphics occur, then this function in will not fire.
  
  ' Set this to ensure that other Map actions like pan or zoom do not occur while trying to get a count of the graphics.
  e.Handled = True
  
  ' Get the GraphicsLayer in the Map.
  Dim theGraphicsLayer As ESRI.ArcGIS.Client.GraphicsLayer = TryCast(Map1.Layers("MyGraphicsLayer"), ESRI.ArcGIS.Client.GraphicsLayer)
  
  ' Get the X and Y pixel coordinates of the mouse pointer of the Map Control (which is a System.Windows.UIElement).
  Dim theScreenPoint As System.Windows.Point = e.GetPosition(Map1)
  
  ' Create a GeneralTransform object to account for difference between pixel coordinates in the Map Control (i.e. theScreenPoint)
  ' and the pixel coordinates of the Application (i.e. theTransformScreenPoint).
  Dim theGeneralTransform As System.Windows.Media.GeneralTransform = Map1.TransformToVisual(Application.Current.RootVisual)
  
  ' Get the X and Y pixel coordinates of the mouse pointer of the Application container (which is a page in the Internet browser).
  Dim theTransformScreenPoint As System.Windows.Point = theGeneralTransform.Transform(theScreenPoint)
  
  ' Get the collection of Graphic objects that are found where the user clicked with the Mouse in the Map Control. 
  Dim theIEnumerbleOfGraphic As IEnumerable(Of ESRI.ArcGIS.Client.Graphic) = theGraphicsLayer.FindGraphicsInHostCoordinates(theTransformScreenPoint)
  
  ' Display back to the user the screen coordinate pixel values of the Map Control where the Mouse was clicked.
  TextBlock_MapX.Text = theScreenPoint.X.ToString
  TextBlock_MapY.Text = theScreenPoint.Y.ToString
  
  ' Display back to the user the screen coordinate pixel values of the Application container where the Mouse was clicked.
  TextBlock_ApplicationX.Text = theTransformScreenPoint.X.ToString
  TextBlock_ApplicationY.Text = theTransformScreenPoint.Y.ToString
  
  ' Display back to the user the number of Graphics found at the location where the Mouse was clicked.
  TextBlock_NumberGraphicsSelected.Text = theIEnumerbleOfGraphic.Count.ToString
  
End Sub