Public Event OpenReadCompleted As EventHandler(Of ArcGISWebClient.OpenReadCompletedEventArgs)

public event EventHandler<ArcGISWebClient.OpenReadCompletedEventArgs> OpenReadCompleted

<Grid x:Name="LayoutRoot" Background="White">
  
  <!-- Url for the ArcGISWebClient operation. This is a token secured ArcGIS Server requiring the correct credentials 
  in order to get information about the layer using the ArcGISWebClient operation. Use the following credentials when
  prompted by the ESRI.ArcGIS.Client.Toolkit.SignInDialog:
  Username: user1
  Passoword: pass.word1
  -->
  <TextBox Height="44" HorizontalAlignment="Left" Margin="4,181,0,0" Name="TextBox_Url" VerticalAlignment="Top" Width="575" 
  Text="http://serverapps10.esri.com/ArcGIS/rest/services/Oil/MapServer/0/query?where=1%3D1&amp;returnCountOnly=true&amp;f=json"
  TextWrapping="Wrap"/>
  
  <!-- Button to perform the work. -->
  <Button Content="OpenReadAsync" Height="24" Width="201" HorizontalAlignment="Left" Margin="4,232,0,0" 
          Name="Button_OpenReadAsync" VerticalAlignment="Top" Click="Button_OpenReadAsync_Click" />
  
  <!-- CheckBox option to display the ArcGISWebClient Response JSON in a MessageBox or TextBox.-->
  <CheckBox Content="Display Results in a MessageBox" Height="16" HorizontalAlignment="Left" Margin="211,235,0,0" 
            Name="CheckBox1" VerticalAlignment="Top" />
  
  <!-- Display the Response for the ArcGISWebClient operation. -->
  <TextBox Height="95" HorizontalAlignment="Left" Margin="4,262,0,0" Name="TextBox_Response" 
           VerticalAlignment="Top" Width="575" VerticalScrollBarVisibility="Auto" 
           HorizontalScrollBarVisibility="Auto" />
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="136" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="625" 
  TextWrapping="Wrap" Text="Click the 'OpenReadAsync' Button to start an ArcGISWebClient operation. Check 
  'on' the CheckBox if you want to see the JSON results in a MessageBox, otherwise the result will
  display in the TextBox. The JSON result returned is a count of the number of features in a FeatureLayer. 
  The Url for this example uses a token secured ArcGIS Server requiring the correct credientials in order 
  to get information about the layer using the ArcGISWebClient operation. Use the following credentials 
  when prompted by the ESRI.ArcGIS.Client.Toolkit.SignInDialog: 
  Username: user1
  Passoword: pass.word1" />
  
</Grid>

private void Button_OpenReadAsync_Click(object sender, System.Windows.RoutedEventArgs e)
{
  // Call the ESRI.ArcGIS.Client.Toolkit.SignInDialog which assists in getting Identity Manager credential
  // information for accessing a token secured service. For test ArcGIS Server web service in this example
  // use the following information:
  // Username: user1
  // Passoword: pass.word1
  ESRI.ArcGIS.Client.IdentityManager.Current.ChallengeMethod = ESRI.ArcGIS.Client.Toolkit.SignInDialog.DoSignIn;
  
  // Clear out any existing information in the TextBox.
  TextBox_Response.Text = "";
  
  // Create a new ArcGISWebClient object.
  ESRI.ArcGIS.Client.ArcGISWebClient myArcGISWebClient = new ESRI.ArcGIS.Client.ArcGISWebClient();
  
  // Wire up an Event Handler for the ArcGISWebClient.OpenReadCompleted Event.
  myArcGISWebClient.OpenReadCompleted += myArcGISWebClient_OpenReadCompleted;
  
  // Get the Url for the ArcGISWebClient request.
  string myUrl = TextBox_Url.Text;
  
  // Get the userState (aka. user token) to determine how to display the results of the ArcGISWebClient operation.
  bool myUserToken = (bool)CheckBox1.IsChecked;
  
  // Invoke the ArcGISWebClient.OpenReadAsync Method passing in the Url, null for the parameter collection, and a user token.
  myArcGISWebClient.OpenReadAsync(new Uri(myUrl), null, ESRI.ArcGIS.Client.ArcGISWebClient.HttpMethods.Auto ,myUserToken);
}
  
private void myArcGISWebClient_OpenReadCompleted(object sender, ESRI.ArcGIS.Client.ArcGISWebClient.OpenReadCompletedEventArgs e)
{
  // Get the userState (aka. user token) from the ArcGISWebClient operation.
  bool myUserToken = (bool)e.UserState;
  
  // Get the JSON string result from the ArcGISWebClient operation.
  System.IO.Stream theStream = e.Result;
  
  // Create a new StreamReader object using the Result of OpenReadCompletedEventArgs
  System.IO.StreamReader theStreamReader = new System.IO.StreamReader(theStream);
  
  // Even though the ArcGISWebClient.OpenReadAsync returned data as a Stream, in this case our return data is
  // really just a string.
  string theResult = theStreamReader.ReadToEnd();
  
  if (myUserToken == true)
  {
    // Display the JSON string response in a MessageBox.
    MessageBox.Show(theResult);
  }
  else
  {
    // Display the JSON string response in the TextBox.
    TextBox_Response.Text = theResult;
  }
}

Private Sub Button_OpenReadAsync_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
  
  ' Call the ESRI.ArcGIS.Client.Toolkit.SignInDialog which assists in getting Identity Manager credential
  ' information for accessing a token secured service. For test ArcGIS Server web service in this example
  ' use the following information:
  ' Username: user1
  ' Passoword: pass.word1
  ESRI.ArcGIS.Client.IdentityManager.Current.ChallengeMethod = AddressOf ESRI.ArcGIS.Client.Toolkit.SignInDialog.DoSignIn
  
  ' Clear out any existing information in the TextBox.
  TextBox_Response.Text = ""
  
  ' Create a new ArcGISWebClient object.
  Dim myArcGISWebClient As ESRI.ArcGIS.Client.ArcGISWebClient = New ESRI.ArcGIS.Client.ArcGISWebClient
  
  ' Wire up an Event Handler for the ArcGISWebClient.OpenReadCompleted Event.
  AddHandler myArcGISWebClient.OpenReadCompleted, AddressOf myArcGISWebClient_OpenReadCompleted
  
  ' Get the Url for the ArcGISWebClient request.
  Dim myUrl As String = TextBox_Url.Text
  
  ' Get the userState (aka. user token) to determine how to display the results of the ArcGISWebClient operation.
  Dim myUserToken As Boolean = CheckBox1.IsChecked
  
  ' Invoke the ArcGISWebClient.OpenReadAsync Method passing in the Url, nothing for the parameter collection, and a user token.
  myArcGISWebClient.OpenReadAsync(New Uri(myUrl), Nothing, ESRI.ArcGIS.Client.ArcGISWebClient.HttpMethods.Auto, myUserToken)
  
End Sub
  
Private Sub myArcGISWebClient_OpenReadCompleted(sender As Object, e As ESRI.ArcGIS.Client.ArcGISWebClient.OpenReadCompletedEventArgs)
  
  ' Get the userState (aka. user token) from the ArcGISWebClient operation.
  Dim myUserToken As Boolean = e.UserState
  
  ' Get the JSON string result from the ArcGISWebClient operation.
  Dim theStream As System.IO.Stream = e.Result
  
  ' Create a new StreamReader object using the Result of OpenReadCompletedEventArgs
  Dim theStreamReader As System.IO.StreamReader = New System.IO.StreamReader(theStream)
  
  ' Even though the ArcGISWebClient.OpenReadAsync returned data as a Stream, in this case our return data is
  ' really just a string.
  Dim theResult As String = theStreamReader.ReadToEnd
  
  If myUserToken = True Then
    
    ' Display the JSON string response in a MessageBox.
    MessageBox.Show(theResult)
    
  Else
    
    ' Display the JSON string response in the TextBox.
    TextBox_Response.Text = theResult
    
  End If
  
End Sub