Public Event MouseEnter As MouseEventHandler

public event MouseEventHandler MouseEnter

<Grid x:Name="LayoutRoot">
  
  <!-- Add a Map control with an ArcGISTiledMapServiceLayer -->
  <esri:Map Background="White" HorizontalAlignment="Left" Margin="12,193,0,0" Name="Map1" 
            VerticalAlignment="Top" Height="275" Width="473" >
    <esri:ArcGISTiledMapServiceLayer ID="PhysicalTiledLayer" 
             Url="http://services.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer"/>
  </esri:Map>
  
  <!-- Add a Button to perform the work. Note the Click Event handler is wired-up to use code-behind. -->
  <Button Content="Click me to add Graphics and move the mouse/sytlus/touch over them." Height="23" 
          HorizontalAlignment="Left" Margin="12,164,0,0" Name="Button1" 
          VerticalAlignment="Top" Width="473" Click="Button1_Click"/>
  
  <!-- 
  Add a TextBox to display information about a Graphic as the mouse/stylus/touch input devices
  moves across each it. 
  -->
  <TextBox Height="84" HorizontalAlignment="Left" Margin="12,74,0,0" Name="TextBox1" 
           VerticalAlignment="Top" Width="473" TextWrapping="Wrap" />
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="65" Name="TextBlock1" VerticalAlignment="Top" TextWrapping="Wrap" Margin="9,3,186,0" 
             Text="Click the button to add two Graphics on the Map. Move the mouse/stylus/touch 
                  pointing device over the Graphics to see Graphic.MouseEnter and 
                  Graphic.MouseLeave event handlers fire which provide information about each Graphic." />
    
  </Grid>

private void Button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
  // This is the driver function that will generate a two Polygon Graphics with an Attribute 
  // and add them to the GraphicLayer of the Map Control. Each Graphic will also have a MouseEnter
  // and MouseLeave Event handler wired up for additional functionality.
  
  // Create a new instance of the GraphicsLayer object 
  ESRI.ArcGIS.Client.GraphicsLayer myGraphicsLayer = new ESRI.ArcGIS.Client.GraphicsLayer();
  
  // Add the first Polygon to the GraphicsLayer
  List<MyPoint> polygon1 = new List<MyPoint>();
  polygon1.Add(new MyPoint(-10.039, -20.303));
  polygon1.Add(new MyPoint(-32.539, -7.0137));
  polygon1.Add(new MyPoint(-53.281, -13.923));
  polygon1.Add(new MyPoint(-62.773, -35.174));
  polygon1.Add(new MyPoint(-33.594, -43.18));
  polygon1.Add(new MyPoint(-11.797, -36.032));
  polygon1.Add(new MyPoint(-10.039, -20.303));
  ESRI.ArcGIS.Client.Graphic aGraphic1 = MakePolygonGraphic(polygon1, 102100, "WOW I AM HERE!");
  myGraphicsLayer.Graphics.Add(aGraphic1);
  
  // Add the second Polygon to the GraphicsLayer
  List<MyPoint> polygon2 = new List<MyPoint>();
  polygon2.Add(new MyPoint(-10.039, 20.303));
  polygon2.Add(new MyPoint(-32.539, 7.0137));
  polygon2.Add(new MyPoint(-62.773, 35.174));
  polygon2.Add(new MyPoint(-11.797, 36.032));
  polygon2.Add(new MyPoint(-10.039, 20.303));
  ESRI.ArcGIS.Client.Graphic aGraphic2 = MakePolygonGraphic(polygon2, 102100, "ITS A NICE DAY!");
  myGraphicsLayer.Graphics.Add(aGraphic2);
  
  // Add the GraphicsLayer to the Layers collection of the Map (this will automatically cause a refresh of the Map). 
  Map1.Layers.Add(myGraphicsLayer);
}
            
// A helper class used to construct MapPoints from coordinate pairs.
public class MyPoint
{
  //The coordinate pairs.
  public double X;
  public double Y;
  
  // The Constructor.
  public MyPoint(double inputX, double inputY)
  {
    X = inputX;
    Y = inputY;
  }
}
            
public ESRI.ArcGIS.Client.Graphic MakePolygonGraphic(List<MyPoint> inputPolygon, int inputSR, string anAttributeValue)
{
  // A helper function that will generate a Polygon Graphic from a list of coordinate pairs, 
  // an integer to define a SpatialRefernce, and an Attribute string that denotes some
  // characteristic of the Graphic.
  
  // Create a new instance of one Graphic.
  ESRI.ArcGIS.Client.Graphic aGraphic = new ESRI.ArcGIS.Client.Graphic();
  
  // Make a new PointCollection to hold the vertices of the Polygon
  ESRI.ArcGIS.Client.Geometry.PointCollection aPointCollection = new ESRI.ArcGIS.Client.Geometry.PointCollection();
            
  // Loop through all of the coordinate pairs (i.e. List(Of MyPoint) objects.
  foreach (MyPoint mp in inputPolygon)
  {
    // Create a SpatialReference for the Graphic.
    ESRI.ArcGIS.Client.Geometry.SpatialReference aSpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(inputSR);
    
    // Create a MapPoint object and set its SpatialReference and coordinate (X,Y) information. 
    ESRI.ArcGIS.Client.Geometry.MapPoint aMapPoint1 = new ESRI.ArcGIS.Client.Geometry.MapPoint(mp.X, mp.Y, aSpatialReference);
  
    // Add the MapPoint to the PointCollection which will be used to define the Polygon verticies.
    aPointCollection.Add(aMapPoint1);
  }
  
  // The PointCollection needs to be added to a new instance of an ObservableCollection.
  System.Collections.ObjectModel.ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection> anObservableCollection = new System.Collections.ObjectModel.ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection>();
  anObservableCollection.Add(aPointCollection);
  
  // Create a new instance of a Polygon object and set the Rings and SpatialReference Properties.
  ESRI.ArcGIS.Client.Geometry.Polygon aPolygon = new ESRI.ArcGIS.Client.Geometry.Polygon();
  aPolygon.Rings = anObservableCollection;
  aPolygon.SpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(inputSR);
  
  // Create a new instance of a SimpleFillSymbol and set its Color, BorderBrush, and BorderThickness Properties.
  ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol aSimpleFillSymbol = new ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol();
  aSimpleFillSymbol.Fill = new System.Windows.Media.SolidColorBrush(Colors.Green);
  aSimpleFillSymbol.BorderBrush = new System.Windows.Media.SolidColorBrush(Colors.Yellow);
  aSimpleFillSymbol.BorderThickness = 5;
            
  // Apply the Graphic's Geometry and Symbol Properties.
  aGraphic.Geometry = (ESRI.ArcGIS.Client.Geometry.Geometry)aPolygon;
  aGraphic.Symbol = (ESRI.ArcGIS.Client.Symbols.Symbol)aSimpleFillSymbol;
  
  // Add an Attribute to the Graphic.
  aGraphic.Attributes.Add("Interesting Fact", anAttributeValue);
  
  // Dynamically wire-up the MouseEnter and MouseLeave Event handlers.
  aGraphic.MouseEnter += Graphic_MouseEnter;
  aGraphic.MouseLeave += Graphic_MouseLeave;
  
  // Return the Graphic to the calling function.
  return aGraphic;
}
            
private void Graphic_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
{
  // This function will obtain the various input arguments for the Graphic.MouseEnter Event 
  // and display the information in a TextBox. The information will be displayed when the 
  // user moves the mouse/stylus/touch pointing device into a Graphic that has an MouseEnter
  // Event wired up. It can be highly useful for displaying Graphic.Attribute information in
  // other FrameworkElement UI Controls.
  
  // Obtain the various variable information from the input arguments.
  string theStylusDeviceType = e.StylusDevice.DeviceType.ToString();
  string theOriginalSource = e.OriginalSource.GetType().ToString();
  ESRI.ArcGIS.Client.Graphic theGraphic = (ESRI.ArcGIS.Client.Graphic)sender;
  string theGraphicExtent = sender.Geometry.Extent.ToString();
  
  // Create a StringBuilder to hold the message we want to display.
  Text.StringBuilder myMessage = new Text.StringBuilder();
  myMessage.Append("The SytlusDevice.DeviceType is: " + theStylusDeviceType + Environment.NewLine);
  myMessage.Append("The OriginalSource object is: " + theOriginalSource + Environment.NewLine);
  myMessage.Append("The Extent of the Graphic is: " + theGraphicExtent + Environment.NewLine);
  string theKey = theGraphic.Attributes.Keys[0].ToString();
  myMessage.Append("The first Attribute information has: Key: " + theKey + ", Value: " + theGraphic.Attributes[theKey]);
  
  // Display the Message in a TextBox.
  TextBox1.Text = myMessage.ToString();
  
  // NOTES:
  // e.StylusDevice is System.Windows.Input.MouseEventArgs.StylusDevice Property
  // e.StylusDevice.DeviceType = TabletDeviceType Enumeration value of (Mouse, Stylus, Touch)
  // e.OriginalSource is System.Windows.Shapes.Path
  // sender = the ESRI.ArcGIS.Client.Graphic
}
            
private void Graphic_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
{
  // Clear the TextBox since the mouse/stylus/touch pointing device is no longer over the Graphic.
  TextBox1.Text = "";
  
  // NOTES:
  // e.StylusDevice is System.Windows.Input.MouseEventArgs.StylusDevice Property
  // e.StylusDevice.DeviceType = TabletDeviceType Enumeration value of (Mouse, Stylus, Touch)
  // e.OriginalSource is ESRI.ArcGIS.Client.Symbols.GraphicElement
  // sender = the ESRI.ArcGIS.Client.Graphic
  
  // Use these variables if you need to:
  // string theStylusDeviceType = e.StylusDevice.DeviceType.ToString();
  // string theOriginalSource = e.OriginalSource.GetType().ToString();
  // ESRI.ArcGIS.Client.Graphic theGraphic = (ESRI.ArcGIS.Client.Graphic)sender;
  // string theGraphicExtent = sender.Geometry.Extent.ToString();
}

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
  
  ' This is the driver function that will generate a two Polygon Graphics with an Attribute 
  ' and add them to the GraphicLayer of the Map Control. Each Graphic will also have a MouseEnter
  ' and MouseLeave Event handler wired up for additional functionality.
  
  ' Create a new instance of the GraphicsLayer object 
  Dim myGraphicsLayer As New ESRI.ArcGIS.Client.GraphicsLayer
  
  ' Add the first Polygon to the GraphicsLayer
  Dim polygon1 As New List(Of MyPoint)
  polygon1.Add(New MyPoint(-10.039, -20.303))
  polygon1.Add(New MyPoint(-32.539, -7.0137))
  polygon1.Add(New MyPoint(-53.281, -13.923))
  polygon1.Add(New MyPoint(-62.773, -35.174))
  polygon1.Add(New MyPoint(-33.594, -43.18))
  polygon1.Add(New MyPoint(-11.797, -36.032))
  polygon1.Add(New MyPoint(-10.039, -20.303))
  Dim aGraphic1 As ESRI.ArcGIS.Client.Graphic = MakePolygonGraphic(polygon1, 102100, "WOW I AM HERE!")
  myGraphicsLayer.Graphics.Add(aGraphic1)
  
  ' Add the second Polygon to the GraphicsLayer
  Dim polygon2 As New List(Of MyPoint)
  polygon2.Add(New MyPoint(-10.039, 20.303))
  polygon2.Add(New MyPoint(-32.539, 7.0137))
  polygon2.Add(New MyPoint(-62.773, 35.174))
  polygon2.Add(New MyPoint(-11.797, 36.032))
  polygon2.Add(New MyPoint(-10.039, 20.303))
  Dim aGraphic2 As ESRI.ArcGIS.Client.Graphic = MakePolygonGraphic(polygon2, 102100, "ITS A NICE DAY!")
  myGraphicsLayer.Graphics.Add(aGraphic2)
  
  ' Add the GraphicsLayer to the Layers collection of the Map (this will automatically cause a refresh of the Map). 
  Map1.Layers.Add(myGraphicsLayer)
  
End Sub
            
' A helper class used to construct MapPoints from coordinate pairs.
Public Class MyPoint
  
  'The coordinate pairs.
  Public X As Double
  Public Y As Double
  
  ' The Constructor.
  Public Sub New(ByVal inputX As Double, ByVal inputY As Double)
    X = inputX
    Y = inputY
  End Sub
  
End Class
            
Public Function MakePolygonGraphic(ByVal inputPolygon As List(Of MyPoint), ByVal inputSR As Integer, ByVal anAttributeValue As String) As ESRI.ArcGIS.Client.Graphic
  
  ' A helper function that will generate a Polygon Graphic from a list of coordinate pairs, 
  ' an integer to define a SpatialRefernce, and an Attribute string that denotes some
  ' characteristic of the Graphic.
  
  ' Create a new instance of one Graphic.
  Dim aGraphic As New ESRI.ArcGIS.Client.Graphic
  
  ' Make a new PointCollection to hold the vertices of the Polygon
  Dim aPointCollection As New ESRI.ArcGIS.Client.Geometry.PointCollection
  
  ' Loop through all of the coordinate pairs (i.e. List(Of MyPoint) objects.
  For Each mp As MyPoint In inputPolygon
    
    ' Create a SpatialReference for the Graphic.
    Dim aSpatialReference As New ESRI.ArcGIS.Client.Geometry.SpatialReference(inputSR)
    
    ' Create a MapPoint object and set its SpatialReference and coordinate (X,Y) information. 
    Dim aMapPoint1 As New ESRI.ArcGIS.Client.Geometry.MapPoint(mp.X, mp.Y, aSpatialReference)
    
    ' Add the MapPoint to the PointCollection which will be used to define the Polygon verticies.
      aPointCollection.Add(aMapPoint1)
    
  Next
  
  ' The PointCollection needs to be added to a new instance of an ObservableCollection.
  Dim anObservableCollection As New System.Collections.ObjectModel.ObservableCollection(Of ESRI.ArcGIS.Client.Geometry.PointCollection)
  anObservableCollection.Add(aPointCollection)
  
  ' Create a new instance of a Polygon object and set the Rings and SpatialReference Properties.
  Dim aPolygon As New ESRI.ArcGIS.Client.Geometry.Polygon
  aPolygon.Rings = anObservableCollection
  aPolygon.SpatialReference = New ESRI.ArcGIS.Client.Geometry.SpatialReference(inputSR)
            
  ' Create a new instance of a SimpleFillSymbol and set its Color, BorderBrush, and BorderThickness Properties.
  Dim aSimpleFillSymbol As New ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol
  aSimpleFillSymbol.Fill = New System.Windows.Media.SolidColorBrush(Colors.Green)
  aSimpleFillSymbol.BorderBrush = New System.Windows.Media.SolidColorBrush(Colors.Yellow)
  aSimpleFillSymbol.BorderThickness = 5
  
  ' Apply the Graphic's Geometry and Symbol Properties.
  aGraphic.Geometry = CType(aPolygon, ESRI.ArcGIS.Client.Geometry.Geometry)
  aGraphic.Symbol = CType(aSimpleFillSymbol, ESRI.ArcGIS.Client.Symbols.Symbol)
  
  ' Add an Attribute to the Graphic.
  aGraphic.Attributes.Add("Interesting Fact", anAttributeValue)
  
  ' Dynamically wire-up the MouseEnter and MouseLeave Event handlers.
  AddHandler aGraphic.MouseEnter, AddressOf Graphic_MouseEnter
  AddHandler aGraphic.MouseLeave, AddressOf Graphic_MouseLeave
  
  ' Return the Graphic to the calling function.
  Return aGraphic
  
End Function
            
Private Sub Graphic_MouseEnter(ByVal sender As System.Object, ByVal e As System.Windows.Input.MouseEventArgs)
  
  ' This function will obtain the various input arguments for the Graphic.MouseEnter Event 
  ' and display the information in a TextBox. The information will be displayed when the 
  ' user moves the mouse/stylus/touch pointing device into a Graphic that has an MouseEnter
  ' Event wired up. It can be highly useful for displaying Graphic.Attribute information in
  ' other FrameworkElement UI Controls.
  
  ' Obtain the various variable information from the input arguments.
  Dim theStylusDeviceType As String = e.StylusDevice.DeviceType.ToString
  Dim theOriginalSource As String = e.OriginalSource.GetType.ToString
  Dim theGraphic As ESRI.ArcGIS.Client.Graphic = CType(sender, ESRI.ArcGIS.Client.Graphic)
  Dim theGraphicExtent As String = sender.Geometry.Extent.ToString
  
  ' Create a StringBuilder to hold the message we want to display.
  Dim myMessage As New Text.StringBuilder
  myMessage.Append("The SytlusDevice.DeviceType is: " + theStylusDeviceType + vbCrLf)
  myMessage.Append("The OriginalSource object is: " + theOriginalSource + vbCrLf)
  myMessage.Append("The Extent of the Graphic is: " + theGraphicExtent + vbCrLf)
  Dim theKey As String = theGraphic.Attributes.Keys(0).ToString
  myMessage.Append("The first Attribute information has: Key: " + theKey + ", Value: " + theGraphic.Attributes.Item(theKey))
  
  ' Display the Message in a TextBox.
  TextBox1.Text = myMessage.ToString
  
  ' NOTES:
  ' e.StylusDevice is System.Windows.Input.MouseEventArgs.StylusDevice Property
  ' e.StylusDevice.DeviceType = TabletDeviceType Enumeration value of (Mouse, Stylus, Touch)
  ' e.OriginalSource is System.Windows.Shapes.Path
  ' sender = the ESRI.ArcGIS.Client.Graphic
  
End Sub
            
Private Sub Graphic_MouseLeave(ByVal sender As System.Object, ByVal e As System.Windows.Input.MouseEventArgs)
  
  ' Clear the TextBox since the mouse/stylus/touch pointing device is no longer over the Graphic.
  TextBox1.Text = ""
  
  ' NOTES:
  ' e.StylusDevice is System.Windows.Input.MouseEventArgs.StylusDevice Property
  ' e.StylusDevice.DeviceType = TabletDeviceType Enumeration value of (Mouse, Stylus, Touch)
  ' e.OriginalSource is ESRI.ArcGIS.Client.Symbols.GraphicElement
  ' sender = the ESRI.ArcGIS.Client.Graphic
  
  ' Use these variables if you need to:
  ' Dim theStylusDeviceType As String = e.StylusDevice.DeviceType.ToString
  ' Dim theOriginalSource As String = e.OriginalSource.GetType.ToString
  ' Dim theGraphic As ESRI.ArcGIS.Client.Graphic = CType(sender, ESRI.ArcGIS.Client.Graphic)
  ' Dim theGraphicExtent As String = sender.Geometry.Extent.ToString
  
End Sub