Private WithEvents inkCanvas1 As New InkCanvas()
    Private inkDA As DrawingAttributes
    Private highlighterDA As DrawingAttributes
    Private useHighlighter As Boolean = False

    ' Add an InkCanvas to the window, and allow the user to 
    ' switch between using a green pen and a purple highlighter 
    ' on the InkCanvas.
    Private Sub WindowLoaded(ByVal sender As Object, ByVal e As RoutedEventArgs)

        inkCanvas1.Background = Brushes.DarkSlateBlue
        inkCanvas1.DefaultDrawingAttributes.Color = Colors.SpringGreen

        ' Add the InkCanvas to the DockPanel, named root.
        root.Children.Add(inkCanvas1)

        ' Set up the DrawingAttributes for the pen.
        inkDA = New DrawingAttributes()
        With inkDA
            .Color = Colors.SpringGreen
            .Height = 5
            .Width = 5
            .FitToCurve = True
        End With

        ' Set up the DrawingAttributes for the highlighter.
        highlighterDA = New DrawingAttributes()
        With highlighterDA
            .Color = Colors.Orchid
            .IsHighlighter = True
            .IgnorePressure = True
            .StylusTip = StylusTip.Rectangle
            .Height = 30
            .Width = 10
        End With

        inkCanvas1.DefaultDrawingAttributes = inkDA

    End Sub 'WindowLoaded


    ' Create a button called switchHighlighter and use 
    ' SwitchHighlighter_Click to handle the Click event.  
    ' The useHighlighter variable is a boolean that indicates
    ' whether the InkCanvas renders ink as a highlighter.

    ' Switch between using the 'pen' DrawingAttributes and the 
    ' 'highlighter' DrawingAttributes when the user clicks on .
    Private Sub SwitchHighlighter_Click(ByVal sender As [Object], ByVal e As RoutedEventArgs)

        useHighlighter = Not useHighlighter

        If useHighlighter Then
            switchHighlighter.Content = "Use Pen"
            inkCanvas1.DefaultDrawingAttributes = highlighterDA
        Else

            switchHighlighter.Content = "Use Highlighter"
            inkCanvas1.DefaultDrawingAttributes = inkDA
        End If

    End Sub 'SwitchHighlighter_Click

        InkCanvas inkCanvas1 = new InkCanvas();
        DrawingAttributes inkDA;
        DrawingAttributes highlighterDA;
        bool useHighlighter = false;

        // Add an InkCanvas to the window, and allow the user to 
        // switch between using a green pen and a purple highlighter 
        // on the InkCanvas.
        private void WindowLoaded(object sender, EventArgs e)
        {
            inkCanvas1.Background = Brushes.DarkSlateBlue;
            inkCanvas1.DefaultDrawingAttributes.Color = Colors.SpringGreen;

            root.Children.Add(inkCanvas1);

            // Set up the DrawingAttributes for the pen.
            inkDA = new DrawingAttributes();
            inkDA.Color = Colors.SpringGreen;
            inkDA.Height = 5;
            inkDA.Width = 5;
            inkDA.FitToCurve = false;

            // Set up the DrawingAttributes for the highlighter.
            highlighterDA = new DrawingAttributes();
            highlighterDA.Color = Colors.Orchid;
            highlighterDA.IsHighlighter = true;
            highlighterDA.IgnorePressure = true;
            highlighterDA.StylusTip = StylusTip.Rectangle;
            highlighterDA.Height = 30;
            highlighterDA.Width = 10;

            inkCanvas1.DefaultDrawingAttributes = inkDA;
        }

        // Create a button called switchHighlighter and use 
        // SwitchHighlighter_Click to handle the Click event.  
        // The useHighlighter variable is a boolean that indicates
        // whether the InkCanvas renders ink as a highlighter.

        // Switch between using the 'pen' DrawingAttributes and the 
        // 'highlighter' DrawingAttributes.
        void SwitchHighlighter_Click(Object sender, RoutedEventArgs e)
        {
            useHighlighter = !useHighlighter;

            if (useHighlighter)
            {
                switchHighlighter.Content = "Use Pen";
                inkCanvas1.DefaultDrawingAttributes = highlighterDA;
            }
            else
            {
                switchHighlighter.Content = "Use Highlighter";
                inkCanvas1.DefaultDrawingAttributes = inkDA;

            }
        }