Public Sub SetSource( _
   ByVal stream As Stream _
) 

public void SetSource( 
   Stream stream
)

<Grid x:Name="LayoutRoot" >
  
  <!-- Define a SimpleRenderer with a SimpleMarkerSymbol as Resource that can be used in other locations of the project. -->
  <Grid.Resources>
    <esri:SimpleRenderer x:Key="renderer">
      <esri:SimpleRenderer.Symbol>
        <esri:SimpleMarkerSymbol Color="Yellow" Size="20" Style="Circle" />
      </esri:SimpleRenderer.Symbol>
    </esri:SimpleRenderer>
  </Grid.Resources>
  
  <!-- Add a Map Control to the application. Set the Extent to North America. -->
  <esri:Map x:Name="Map1" HorizontalAlignment="Left" VerticalAlignment="Top" 
        Margin="0,212,0,0" Height="376" 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="0,183,0,0"  VerticalAlignment="Top" 
          Width="415" Content="Add a CsvLayer (via code-behind) for the specified Url."
          Click="Button1_Click" />
  
  <!-- 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 CsvLayer will be 
             created using a local Resouce in the Visual Studio project. The CsvLayer.SetSource Method is
             used to get the local Resource as a Stream." />
</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();
  
  // Create a new Uri for the CSV file located on the hard drive. 
  // VERY IMPORTANT: 
  // Replace the first parameter argument of the Uri constructor with the correct string to the location of the CSV 
  // file relative to your test project. In this example the Visual Studio project name is: "TestProject".
  // Additionally, a folder was added to "TestProject" called "myFolder" and this is where the "US_Cities_Top_5.csv 
  // file is located. Finally, make sure that the for the Properties of the US_Cities_Top_5.csv file that the 
  // 'Build Action' is set to 'Resource'.
  Uri myUri = new Uri("/TestProject;component/myFolder/US_Cities_Top_5.csv", UriKind.RelativeOrAbsolute);
  
  // Create a StreamResourceInfo object using the static/Shared Application.GetResourceStream function.
  System.Windows.Resources.StreamResourceInfo myStreamResourceInfo = Application.GetResourceStream(myUri);
  
  // Use the StreamResourceInfo.Stream in the CsvLayer.SetSource Method 
  myCsvLayer.SetSource(myStreamResourceInfo.Stream);
  
  // Set the ID of the CsvLayer.
  myCsvLayer.ID = "US_Cities_Top_5";
  
  // Use the SimpleRenderer with a SimpleMarkerSymbol that was defined in XAML for the CsvLayer.Render Property.
  myCsvLayer.Renderer = (ESRI.ArcGIS.Client.IRenderer)LayoutRoot.Resources["renderer"];
  
  // Add the CsvLayer to the Map.
  Map1.Layers.Add(myCsvLayer);
}

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
  
  ' Create a new Uri for the CSV file located on the hard drive. 
  ' VERY IMPORTANT: 
  ' Replace the first parameter argument of the Uri constructor with the correct string to the location of the CSV 
  ' file relative to your test project. In this example the Visual Studio project name is: "TestProject".
  ' Additionally, a folder was added to "TestProject" called "myFolder" and this is where the "US_Cities_Top_5.csv 
  ' file is located. Finally, make sure that the for the Properties of the US_Cities_Top_5.csv file that the
  ' 'Build Action' is set to 'Resource'.
  Dim myUri As Uri = New Uri("/TestProject;component/myFolder/US_Cities_Top_5.csv", UriKind.RelativeOrAbsolute)
  
  ' Create a StreamResourceInfo object using the static/Shared Application.GetResourceStream function.
  Dim myStreamResourceInfo As Windows.Resources.StreamResourceInfo = Application.GetResourceStream(myUri)
  
  ' Use the StreamResourceInfo.Stream in the CsvLayer.SetSource Method 
  myCsvLayer.SetSource(myStreamResourceInfo.Stream)
  
  ' Set the ID of the CsvLayer.
  myCsvLayer.ID = "US_Cities_Top_5"
  
  ' Use the SimpleRenderer with a SimpleMarkerSymbol that was defined in XAML for the CsvLayer.Render Property.
  myCsvLayer.Renderer = LayoutRoot.Resources("renderer")
  
  ' Add the CsvLayer to the Map.
  Map1.Layers.Add(myCsvLayer)
  
End Sub