Public Property YFieldName As String

public string YFieldName {get; set;}

<Grid x:Name="LayoutRoot" >
  
  <!-- Add a Map Control to the application. Set the Extent to North America. -->
  <esri:Map x:Name="Map1" HorizontalAlignment="Left" VerticalAlignment="Top" 
        Margin="0,238,0,0" Height="350" Width="415" Extent="-15219969,2609636,-6232883,6485365">
    
    <!-- Add a backdrop ArcGISTiledMapServiceLayer. -->
    <esri:ArcGISTiledMapServiceLayer  ID="World_Topo_Map" 
          Url="http://services.arcgisonline.com/arcgis/rest/services/world_topo_map/MapServer" />
  
  </esri:Map>
  
  <!-- Add a Button that will allow the user to add a CsvLayer via code-behind. -->
  <Button Name="Button1" Height="23" HorizontalAlignment="Left" Margin="0,209,0,0"  VerticalAlignment="Top" 
          Width="706" Content="Add a CsvLayer (via code-behind) for the specified Url."
          Click="Button1_Click" />
  
  <!-- TextBox to display attribute information about about the CsvLayer added to the Map. -->
  <TextBox Height="350" HorizontalAlignment="Left" Margin="421,238,0,0" Name="TextBox1" VerticalAlignment="Top" 
           Width="285" />
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="174" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="788" 
             TextWrapping="Wrap" Text="Click the Button to add a CsvLayer to the Map. The ID of the layer and 
             its attribute information will displayed in the TextBox." />
</Grid>

private void Button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
  // This function executes as a result of the user clicking the Button. It adds a CsvLayer using code-behind.
  
  // Create a CsvLayer. 
  ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer myCsvLayer = new ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer();
  
  // Set the Url of the CsvLayer to a public service. 
  // NOTE: you need to adjust the Url to a .csv file served up on you test web server.
  myCsvLayer.Url = "http://www.yourserver.com/CSV_Files/US_Cities_Top_3.csv";
  
  // Set the ID of the CsvLayer.
  myCsvLayer.ID = "US_Cities_Top_3";
  
  // Set the XFieldName and YFieldName Properties. This CSV file does not use standard X & Y field names.
  myCsvLayer.XFieldName = "MySuperX";
  myCsvLayer.YFieldName = "MySuperY";
  
  // Create a SimpleMarkerSymbol (a black square) for the CsvLayer that will be added.
  ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol theSimpleMarkerSymbol = new ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol();
  theSimpleMarkerSymbol.Color = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Black);
  theSimpleMarkerSymbol.Size = 12;
  theSimpleMarkerSymbol.Style = ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol.SimpleMarkerStyle.Square;
  
  // Define a SimpleRenderer and set the Symbol to the SimpleMarkerSymbol.
  ESRI.ArcGIS.Client.SimpleRenderer theSimpleRenderer = new ESRI.ArcGIS.Client.SimpleRenderer();
  theSimpleRenderer.Symbol = theSimpleMarkerSymbol;
  
  // Define the Renderer for the CsvLayer.
  myCsvLayer.Renderer = theSimpleRenderer;
  
  // Wire-up the Initialized Event of the CsvLayer. 
  myCsvLayer.Initialized += CsvLayer_Initialized;
  
  // Add the CsvLayer to the Map.
  Map1.Layers.Add(myCsvLayer);
}
            
private void CsvLayer_Initialized(object sender, EventArgs e)
{
  // This function will execute as a result of the CsvLayer that was defined in code-behind being Initialized.
  
  // Get the CsvLayer.
  ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer myCsvLayer = (ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer)sender;
  
  // Get the ID of the CsvLayer.
  string myID = myCsvLayer.ID;
  
  // Create a StringBuilder object to hold information about the CsvLayer and add some useful information to it.
  System.Text.StringBuilder myStringBuilder = new System.Text.StringBuilder();
  myStringBuilder.Append("The CsvLayer and it's ID is: " + Environment.NewLine);
  myStringBuilder.Append(myID + Environment.NewLine);
  myStringBuilder.Append("====================================" + Environment.NewLine);
  
  // Get the GraphicCollection from the CsvLayer.
  ESRI.ArcGIS.Client.GraphicCollection theGraphicCollection = myCsvLayer.Graphics;
  if (theGraphicCollection != null)
  {
    // Loop through each Graphic.
    foreach (ESRI.ArcGIS.Client.Graphic oneGraphic in theGraphicCollection)
    {
      // Get the Attribute Keys. 
      System.Collections.Generic.ICollection<string> theFieldNameKeys = oneGraphic.Attributes.Keys;
      
      // Loop through each Attribute.
      foreach (var oneKey in theFieldNameKeys)
      {
        // Get the value of the Attribute Field.
        string theValue = (string)oneGraphic.Attributes[oneKey];
        
        // Add the Attribute Field name and Attribute value to the StringBuilder object.
        myStringBuilder.Append(oneKey.ToString() + ": " + theValue + Environment.NewLine);
      }
    }
  }
  
  // Display the results of the StringBuilder text to the user.
  TextBox1.Text = myStringBuilder.ToString();
}

Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
  
  ' This function executes as a result of the user clicking the Button. It adds a CsvLayer using code-behind.
  
  ' Create a CsvLayer. 
  Dim myCsvLayer As ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer = New ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer
  
  ' Set the Url of the CsvLayer to a public service. 
  ' NOTE: you need to adjust the Url to a .csv file served up on you test web server.
  myCsvLayer.Url = "http://www.yourserver.com/CSV_Files/US_Cities_Top_3.csv"
  
  ' Set the ID of the CsvLayer.
  myCsvLayer.ID = "US_Cities_Top_3"
  
  ' Set the XFieldName and YFieldName Properties. This CSV file does not use standard X & Y field names.
  myCsvLayer.XFieldName = "MySuperX"
  myCsvLayer.YFieldName = "MySuperY"
  
  ' Create a SimpleMarkerSymbol (a black square) for the CsvLayer that will be added.
  Dim theSimpleMarkerSymbol As ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol = New ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol
  theSimpleMarkerSymbol.Color = New System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Black)
  theSimpleMarkerSymbol.Size = 12
  theSimpleMarkerSymbol.Style = ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol.SimpleMarkerStyle.Square
  
  ' Define a SimpleRenderer and set the Symbol to the SimpleMarkerSymbol.
  Dim theSimpleRenderer As ESRI.ArcGIS.Client.SimpleRenderer = New ESRI.ArcGIS.Client.SimpleRenderer
  theSimpleRenderer.Symbol = theSimpleMarkerSymbol
  
  ' Define the Renderer for the CsvLayer.
  myCsvLayer.Renderer = theSimpleRenderer
  
  ' Wire-up the Initialized Event of the CsvLayer.
  AddHandler myCsvLayer.Initialized, AddressOf CsvLayer_Initialized
  
  ' Add the CsvLayer to the Map.
  Map1.Layers.Add(myCsvLayer)
  
End Sub
            
Private Sub CsvLayer_Initialized(sender As Object, e As EventArgs)
  
  ' This function will execute as a result of the CsvLayer that was defined in code-behind being Initialized.
  
  ' Get the CsvLayer.
  Dim myCsvLayer As ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer = CType(sender, ESRI.ArcGIS.Client.Toolkit.DataSources.CsvLayer)
  
  ' Get the ID of the CsvLayer.
  Dim myID As String = myCsvLayer.ID
  
  ' Create a StringBuilder object to hold information about the CsvLayer and add some useful information to it.
  Dim myStringBuilder As New Text.StringBuilder
  myStringBuilder.Append("The CsvLayer and it's ID is: " + vbCrLf)
  myStringBuilder.Append(myID + vbCrLf)
  myStringBuilder.Append("====================================" + vbCrLf)
  
  ' Get the GraphicCollection from the CsvLayer.
  Dim theGraphicCollection As ESRI.ArcGIS.Client.GraphicCollection = myCsvLayer.Graphics
  If theGraphicCollection IsNot Nothing Then
    
    ' Loop through each Graphic.
    For Each oneGraphic As ESRI.ArcGIS.Client.Graphic In theGraphicCollection
      
      ' Get the Attribute Keys. 
      Dim theFieldNameKeys As System.Collections.Generic.ICollection(Of String) = oneGraphic.Attributes.Keys
      
      ' Loop through each Attribute.
      For Each oneKey In theFieldNameKeys
        
        ' Get the value of the Attribute Field.
        Dim theValue As String = oneGraphic.Attributes(oneKey)
        
        ' Add the Attribute Field name and Attribute value to the StringBuilder object.
        myStringBuilder.Append(oneKey.ToString + ": " + theValue + vbCrLf)
        
      Next
      
    Next
    
  End If
  
  ' Display the results of the StringBuilder text to the user.
  TextBox1.Text = myStringBuilder.ToString
  
End Sub