Public Property ClientCertificate As X509Certificate

public X509Certificate ClientCertificate {get; set;}

<Grid x:Name="LayoutRoot">
  
  <!-- Use XAML Resources to hold a MVVM strategy for accessing a PKI secured ArcGIS FeatureLayer. -->
  <!-- NOTE: Don't forget to add the xml namespace for 'local' to match your client application's name
  at the top of the x:Class declaration. Ex: xmlns:local="clr-namespace:WpfApplication1"-->
  <Grid.Resources>
    <local:MyViewModel x:Key="MyViewModel"/>
  </Grid.Resources>
  
  <!-- Add a Map Control. -->
  <esri:Map x:Name="MyMap" Height="288" VerticalAlignment="Bottom">
       
    <!-- Set the default Extent and SpatialReference of the Map Control. -->
    <esri:Map.Extent >
      <esri:Envelope XMin="-178.21" YMin="18.92" XMax="-66.96" YMax="71.40">
        <esri:Envelope.SpatialReference>
          <esri:SpatialReference WKID="4269"/>
        </esri:Envelope.SpatialReference>
      </esri:Envelope>
    </esri:Map.Extent>
       
    <esri:LayerCollection>
      <!-- Add a secured FeatureLayer. The .InitializationFailed Event is wired up in code-behind to provide feedback if 
      something is wrong accessing the secured web service. The .ClientCertificate Property using XAML binding to consume 
      the MVVM class called 'MyMiewModel' in the code-behind. A .Where clause is added to the FeatureLayer to restrict 
      the number of features returned to speed up display.
      TODO: You need to specify the correct .Url to the secured https:// ArcGIS Server web service and .Where clause if desired. 
      -->
      <esri:FeatureLayer 
            Url="https://www.yoursite.com/arcgis/rest/services/test/us_states/MapServer/0"
            InitializationFailed="FeatureLayer_InitializationFailed"         
            ClientCertificate="{Binding Certificate, Source={StaticResource MyViewModel}}" 
            Where="POP1990>10000000"/>
    </esri:LayerCollection>
    
  </esri:Map>
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="42" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="578" 
             TextWrapping="Wrap" Text="A Model-View-View-Model (MVVM) approach to loading an https:// secured FeatureLayer using
             PKI is displayed. The .ClientCertificate Property is used to consume a X509Certificate." />
  
</Grid>

public partial class MainWindow : Window
{
  public MainWindow()
  {
    InitializeComponent();
  }
  
  private void FeatureLayer_InitializationFailed(object sender, EventArgs e)
  {
    // Display a MessageBox with Error information if there is a problem loading the FeatureLayer. 
    ESRI.ArcGIS.Client.Layer theLayer = (ESRI.ArcGIS.Client.Layer)sender;
    MessageBox.Show("Error initializing layer: " + theLayer.InitializationFailure.Message);
  }
}
            
// Create a Model-View-View-Model (MVVM) class to be used in the XAML. 
public class MyViewModel : System.ComponentModel.INotifyPropertyChanged
{
  public MyViewModel()
  {
    // Create a new instance of a X509Store object (which is a physical store where certificates are persisted and managed).
    // The X509Store object uses a StoreName based upon a 'personal certificate' and a StoreLocation for the user that 
    // is currently logged in. The X509Store is accessed as ReadOnly to obtain the certificate. 
    // NOTE: Don't forget to add a Reference to the System.Security Assembly.
    System.Security.Cryptography.X509Certificates.X509Store theX509Store = null;
    System.Security.Cryptography.X509Certificates.StoreName theStoreName = System.Security.Cryptography.X509Certificates.StoreName.My;
    System.Security.Cryptography.X509Certificates.StoreLocation theStoreLocation = System.Security.Cryptography.X509Certificates.StoreLocation.CurrentUser;
    theX509Store = new System.Security.Cryptography.X509Certificates.X509Store(theStoreName, theStoreLocation);
    theX509Store.Open(System.Security.Cryptography.X509Certificates.OpenFlags.ReadOnly);
    
    // Obtain the collection of certificates in the X509Store. Note: depending on your organization there may multiple certificates!
    System.Security.Cryptography.X509Certificates.X509Certificate2Collection theCertificates = theX509Store.Certificates;
    
    // Find a specific certificate by it's unique name. 
    // TODO: You need to supply the correct certificate name (i.e. the 2nd parameter 'FindValue').
    theCertificates = theX509Store.Certificates.Find(System.Security.Cryptography.X509Certificates.X509FindType.FindBySubjectName, "adftest", true);
    
    // Only continue if at least one certificate is available.
    if (theCertificates.Count > 0)
    {
      // Set the X509Certificate to the first certificate in the collection. This will be used in constructing the FeatureLayer.
      Certificate = theCertificates[0];
    }
  }
  
  // This returns the certificate in the following XAML binding sytnax:
  // ClientCertificate="{Binding Certificate, Source={StaticResource MyViewModel}}"
  private System.Security.Cryptography.X509Certificates.X509Certificate theCertificate;
  public System.Security.Cryptography.X509Certificates.X509Certificate Certificate
  {
    get
    {
      return theCertificate;
    }
    set
    {
      if (theCertificate != value)
      {
        theCertificate = value;
        OnPropertyChanged("Certificate");
      }
    }
  }
  
  // This wired up Event occurs whenever the Certificate Property changes, which braodcasts the certificate.
  public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
  private void OnPropertyChanged(string property)
  {
    if (PropertyChanged != null)
      PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(property));
  }
}

Class MainWindow 
  
  Public Sub New()
    InitializeComponent()
  End Sub
  
  Private Sub FeatureLayer_InitializationFailed(sender As System.Object, e As System.EventArgs)
  
    ' Display a MessageBox with Error information if there is a problem loading the FeatureLayer. 
    Dim theLayer As ESRI.ArcGIS.Client.Layer = CType(sender, ESRI.ArcGIS.Client.Layer)
    MessageBox.Show("Error initializing layer: " + theLayer.InitializationFailure.Message)
    
  End Sub
  
End Class
            
' Create a Model-View-View-Model (MVVM) class to be used in the XAML. 
Public Class MyViewModel
  Implements ComponentModel.INotifyPropertyChanged
  
  Public Sub New()
    
    ' Create a new instance of a X509Store object (which is a physical store where certificates are persisted and managed).
    ' The X509Store object uses a StoreName based upon a 'personal certificate' and a StoreLocation for the user that 
    ' is currently logged in. The X509Store is accessed as ReadOnly to obtain the certificate. 
    ' NOTE: Don't forget to add a Reference to the System.Security Assembly.
    Dim theX509Store As System.Security.Cryptography.X509Certificates.X509Store = Nothing
    Dim theStoreName As System.Security.Cryptography.X509Certificates.StoreName = System.Security.Cryptography.X509Certificates.StoreName.My
    Dim theStoreLocation As System.Security.Cryptography.X509Certificates.StoreLocation = System.Security.Cryptography.X509Certificates.StoreLocation.CurrentUser
    theX509Store = New System.Security.Cryptography.X509Certificates.X509Store(theStoreName, theStoreLocation)
    theX509Store.Open(System.Security.Cryptography.X509Certificates.OpenFlags.ReadOnly)
    
    ' Obtain the collection of certificates in the X509Store. Note: depending on your organization there may multiple certificates!
    Dim theCertificates As System.Security.Cryptography.X509Certificates.X509Certificate2Collection = theX509Store.Certificates
    
    ' Find a specific certificate by it's unique name. 
    ' TODO: You need to supply the correct certificate name (i.e. the 2nd parameter 'FindValue').
    theCertificates = theX509Store.Certificates.Find(System.Security.Cryptography.X509Certificates.X509FindType.FindBySubjectName, "adftest", True)
    
    ' Only continue if at least one certificate is available.
    If theCertificates.Count > 0 Then
      
      ' Set the X509Certificate to the first certificate in the collection. This will be used in constructing the FeatureLayer.
      Certificate = theCertificates(0)
    End If
    
  End Sub
  
  ' This returns the certificate in the following XAML binding sytnax:
  ' ClientCertificate="{Binding Certificate, Source={StaticResource MyViewModel}}"
  Private theCertificate As System.Security.Cryptography.X509Certificates.X509Certificate
  Public Property Certificate() As System.Security.Cryptography.X509Certificates.X509Certificate
    Get
      Return theCertificate
    End Get
    Set(ByVal value As System.Security.Cryptography.X509Certificates.X509Certificate)
      If theCertificate IsNot value Then
        theCertificate = value
        OnPropertyChanged("Certificate")
      End If
    End Set
  End Property
            
  ' This wired up Event occurs whenever the Certificate Property changes, which braodcasts the certificate.
  Public Event PropertyChanged As ComponentModel.PropertyChangedEventHandler Implements ComponentModel.INotifyPropertyChanged.PropertyChanged
  Private Sub OnPropertyChanged(ByVal [property] As String)
    RaiseEvent PropertyChanged(Me, New ComponentModel.PropertyChangedEventArgs([property]))
  End Sub
  
End Class