Public ReadOnly Property Units As String

public string Units {get;}

<Grid x:Name="LayoutRoot">
  
  <!-- Add a Stack Panel that will be used to hold the Map Control that is added via code-behind.  -->
  <StackPanel HorizontalAlignment="Left" Margin="12,288,0,0" Name="StackPanel1" 
              VerticalAlignment="Top" Width="775" Height="300">
  </StackPanel>
  
  <!-- 
  Add a ComboBox that allows the user to choose Url's for specifying different ArcGISTiledMapServiceLayer's.
  Each ArcGISTiledMapServiceLayer has unique Units and SpatialReference information. 
  -->
  <sdk:Label Height="28" HorizontalAlignment="Left" Margin="13,62,0,0" Name="Label1" 
       VerticalAlignment="Top" Width="26" Content="Url:"/>
  <ComboBox Height="28" HorizontalAlignment="Left" Margin="41,54,0,0" Name="ComboBox1" VerticalAlignment="Top" 
            Width="746" SelectedIndex="0">
    <ComboBoxItem>
      http://server.arcgisonline.com/ArcGIS/rest/services/Reference/ESRI_BoundariesPlaces_World_2D/MapServer
    </ComboBoxItem>
    <ComboBoxItem>
      http://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer
    </ComboBoxItem>
    <ComboBoxItem>
      http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/TaxParcel/IndustryFocusedPublicAccessMap/MapServer
    </ComboBoxItem>
  </ComboBox>
  
  <!-- Add a Button to perform the work. -->
  <Button Content="Load an ArcGISTiledMapServiceLayer" Height="25" HorizontalAlignment="Left" 
          Margin="11,257,0,0" Name="Button1" VerticalAlignment="Top" Width="776" Click="Button1_Click"/>
  
  <!-- Display information about the ArcGISTiledMapServiceLayer.Units. -->
  <sdk:Label HorizontalAlignment="Left" Margin="12,90,0,0" Name="Label2" Width="32" Content="Units:"
       VerticalAlignment="Top" Height="25" />
  <TextBlock Height="28" HorizontalAlignment="Left" Margin="48,87,0,0" Name="TextBlock_Units" 
             VerticalAlignment="Top" Width="145" />
  
  <!-- Display information about the ArcGISTiledMapServiceLayer.SpatialReference. -->
  <sdk:Label Height="28" Margin="12,118,0,0" Name="Label3" HorizontalAlignment="Left"
       VerticalAlignment="Top" Content="SpatialReference:"/>
  <TextBlock Height="118" HorizontalAlignment="Left" Margin="12,133,0,0" Name="TextBlock_SpatialReference"  
             VerticalAlignment="Top" Width="775" TextWrapping="Wrap"/>
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="50" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="787" 
             TextWrapping="Wrap" Text="Choose a Url from the ComboBox and then click the Button. A Map Control 
             will be created on-the-fly via code-behind and then an ArcGISTiledMapServiceLayer for the Url 
             will be added to the Map. The Units and SpatialReference information will be displayed." />
  
</Grid>

// NOTE: From the ESRI.ArcGIS.Client.Map.SpatialReference API documentation:
// -------------------------------------------------------------------------
// The SpatialReference of the Map can be overridden (meaning that you can set the Map.SpatialReference) by 
// explicitly setting the Map.Extent Property with an Envelope that has an Envelope.SpatialReference defined. 
// Initializing a Map’s SpatialReference via the Map.Extent Property has to be done before any layers will be 
// added to the Map. Once the SpatialReference of a Map has been set and the layers have been loaded, the 
// SpatialReference can no longer be changed. If you need to change SpatialReference on the fly, you can 
// instead create a new Map instance, move the layers to this Map, and replace the previous Map instance. 
            
private void Button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
  // In this code example, each of the Url's options for the ArcGISTiledMapServiceLayer in the ComboBox
  // will have a different SpatialReference. To make this sample work, we construct the Map Control on-the-fly
  // for each user choice of the ComboBox to accomodate the changing SpatialReference values.
  
  // Get the StackPanel that was defined in a XAML and remove all child controls.
  StackPanel theStackPanel = (StackPanel)(LayoutRoot.Children[0]);
  theStackPanel.Children.Clear();
  
  // Create a new Map Control, define the initial size properties and wrapwround mode, and then add it to the
  // StackPanel UI Control.
  ESRI.ArcGIS.Client.Map Map1 = new ESRI.ArcGIS.Client.Map();
  Map1.WrapAround = true;
  Map1.Height = 300;
  Map1.Width = 775;
  theStackPanel.Children.Add(Map1);
  
  // Get the user choice from the ComboBox that contains the Url for defining an ArcGISTiledMapServiceLayer.
  string theUrl = ComboBox1.SelectionBoxItem.ToString();
  if (theUrl != null)
  {
    // Create a new ArcGISTiledMapServiceLayer using the Url and add it to the Map Control. 
    ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer theArcGISTiledMapServiceLayer = new ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer();
    theArcGISTiledMapServiceLayer.Url = theUrl;
    Map1.Layers.Add(theArcGISTiledMapServiceLayer);
    
    // Wire up the Initialized Event Handler. This will be used to display the ArcGISTiledMapServiceLayer Unit and
    // SpatialReference information.
    theArcGISTiledMapServiceLayer.Initialized += theArcGISTiledMapServiceLayer_Initialized;
  }
}
            
private void theArcGISTiledMapServiceLayer_Initialized(object sender, EventArgs e)
{
  // Get the ArcGISTiledMapServiceLayer. 
  ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer theArcGISTiledMapServiceLayer = null;
  theArcGISTiledMapServiceLayer = (ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer)sender;
  
  // Get and display the ArcGISTiledMapServiceLayer.Units information.
  string theUnits = theArcGISTiledMapServiceLayer.Units;
  TextBlock_Units.Text = theUnits;
  
  // Get and display the ArcGISTiledMapServiceLayer.SpatialReference information.
  ESRI.ArcGIS.Client.Geometry.SpatialReference theSpatialReference = theArcGISTiledMapServiceLayer.SpatialReference;
  if (theSpatialReference != null)
  {
    int theWKID = theSpatialReference.WKID;
    string theWKT = theSpatialReference.WKT;
    if (theWKID != 0)
    {
      TextBlock_SpatialReference.Text = "WKID: " + theWKID.ToString();
    }
      else
    {
      TextBlock_SpatialReference.Text = "WKT: " + theWKT;
    }
  }
}

' NOTE: From the ESRI.ArcGIS.Client.Map.SpatialReference API documentation:
' -------------------------------------------------------------------------
' The SpatialReference of the Map can be overridden (meaning that you can set the Map.SpatialReference) by 
' explicitly setting the Map.Extent Property with an Envelope that has an Envelope.SpatialReference defined. 
' Initializing a Map’s SpatialReference via the Map.Extent Property has to be done before any layers will be 
' added to the Map. Once the SpatialReference of a Map has been set and the layers have been loaded, the 
' SpatialReference can no longer be changed. If you need to change SpatialReference on the fly, you can 
' instead create a new Map instance, move the layers to this Map, and replace the previous Map instance. 
            
Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
  
  ' In this code example, each of the Url's options for the ArcGISTiledMapServiceLayer in the ComboBox
  ' will have a different SpatialReference. To make this sample work, we construct the Map Control on-the-fly
  ' for each user choice of the ComboBox to accomodate the changing SpatialReference values.
  
  ' Get the StackPanel that was defined in a XAML and remove all child controls.
  Dim theStackPanel As StackPanel = CType(LayoutRoot.Children(0), StackPanel)
  theStackPanel.Children.Clear()
  
  ' Create a new Map Control, define the initial size properties and wrapwround mode, and then add it to the
  ' StackPanel UI Control.
  Dim Map1 As ESRI.ArcGIS.Client.Map = New ESRI.ArcGIS.Client.Map
  Map1.WrapAround = True
  Map1.Height = 300
  Map1.Width = 775
  theStackPanel.Children.Add(Map1)
  
  ' Get the user choice from the ComboBox that contains the Url for defining an ArcGISTiledMapServiceLayer.
  Dim theUrl As String = ComboBox1.SelectionBoxItem.ToString
  If theUrl IsNot Nothing Then
    
    ' Create a new ArcGISTiledMapServiceLayer using the Url and add it to the Map Control. 
    Dim theArcGISTiledMapServiceLayer As New ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer
    theArcGISTiledMapServiceLayer.Url = theUrl
    Map1.Layers.Add(theArcGISTiledMapServiceLayer)
    
    ' Wire up the Initialized Event Handler. This will be used to display the ArcGISTiledMapServiceLayer Unit and
    ' SpatialReference information.
    AddHandler theArcGISTiledMapServiceLayer.Initialized, AddressOf theArcGISTiledMapServiceLayer_Initialized
    
  End If
  
End Sub
            
Private Sub theArcGISTiledMapServiceLayer_Initialized(sender As Object, e As EventArgs)
  
  ' Get the ArcGISTiledMapServiceLayer. 
  Dim theArcGISTiledMapServiceLayer As ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer
  theArcGISTiledMapServiceLayer = CType(sender, ESRI.ArcGIS.Client.ArcGISTiledMapServiceLayer)
  
  ' Get and display the ArcGISTiledMapServiceLayer.Units information.
  Dim theUnits As String = theArcGISTiledMapServiceLayer.Units
  TextBlock_Units.Text = theUnits
  
  ' Get and display the ArcGISTiledMapServiceLayer.SpatialReference information.
  Dim theSpatialReference As ESRI.ArcGIS.Client.Geometry.SpatialReference = theArcGISTiledMapServiceLayer.SpatialReference
  If theSpatialReference IsNot Nothing Then
    Dim theWKID As Integer = theSpatialReference.WKID
    Dim theWKT As String = theSpatialReference.WKT
    If theWKID <> Nothing Then
      TextBlock_SpatialReference.Text = "WKID: " + theWKID.ToString
    Else
      TextBlock_SpatialReference.Text = "WKT: " + theWKT
    End If
  End If
  
End Sub