Silverlight RichTextBox control in VB.NET

In this article we will learn how to use RichTextBox control in Silverlight 4.
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In this article we will learn how to use RichTextBox control in Silverlight 4.

RichTextBox control

The RichTextBox control that supports rich formatting, automatic line wrapping, HTML and RTF import/export, table support, images and more.

Properties : This control has the following properties.


Figure 1.

For example

Taking some control on the form. The form looks like this.


Figure 2.

XAML code

<UserControl x:Class="SilverlightApplication40.MainPage"






    d:DesignHeight="300" d:DesignWidth="400">

    <Canvas x:Name="LayoutRoot" Background="White">

        <StackPanel Orientation="Horizontal" Canvas.Left="10" Canvas.Top="20" Height="30">

            <Button x:Name="makeBold" Width="24" Height="23"  Margin="10, 2, 2, 2"ToolTipService.ToolTip="Bold">

                <TextBlock x:Name="boldText" Text="B" FontFamily="Arial" FontSize="14"FontWeight="Bold" HorizontalAlignment="Center" 

VerticalAlignment="Center" />


            <Button x:Name="makeItalic" Width="24" Height="23" Margin="2"ToolTipService.ToolTip="Italic">

                <TextBlock x:Name="italicText" Text="I" FontFamily="Arial" FontSize="14"FontStyle="Italic" HorizontalAlignment="Center" 

VerticalAlignment="Center" />


            <Button x:Name="makeUnderline" Width="24" Height="23" Margin="2"ToolTipService.ToolTip="Underline">

                <TextBlock x:Name="underlineText" Text="U" FontFamily="Arial" FontSize="14"TextDecorations="Underline" 

HorizontalAlignment="Center" VerticalAlignment="Center" />


            <ComboBox x:Name="selectFontFamily" Width="155" Height="23" Margin="10, 2, 2, 2">

                <ComboBoxItem Content="Arial" FontSize="14" FontFamily="Arial" IsSelected="True" />

                <ComboBoxItem Content="Arial Black" FontSize="14" FontFamily="Arial Black" />

                <ComboBoxItem Content="Comic Sans MS" FontSize="14" FontFamily="Comic Sans MS" />

                <ComboBoxItem Content="Courier New" FontSize="14" FontFamily="Courier New" />

                <ComboBoxItem Content="Lucida Grande" FontSize="14" FontFamily="Lucida Grande" />

                <ComboBoxItem Content="Lucida Sans Unicode" FontSize="14" FontFamily="Lucida Sans Unicode" />

                <ComboBoxItem Content="Times New Roman" FontSize="14" FontFamily="Times New Roman" />

                <ComboBoxItem Content="Trebuchet MS" FontSize="14" FontFamily="Trebuchet MS" />

                <ComboBoxItem Content="Verdana" FontSize="14" FontFamily="Verdana" />



            <ComboBox x:Name="selectFontSize" Width="45" Height="23" Margin="2">

                <ComboBoxItem Content="8" IsSelected="True" />

                <ComboBoxItem Content="9" />

                <ComboBoxItem Content="10" IsSelected="True" />

                <ComboBoxItem Content="11" />

                <ComboBoxItem Content="12" />

                <ComboBoxItem Content="14" />

                <ComboBoxItem Content="16" />

                <ComboBoxItem Content="18" />

                <ComboBoxItem Content="20" />

                <ComboBoxItem Content="22" />

                <ComboBoxItem Content="24" />

                <ComboBoxItem Content="26" />

                <ComboBoxItem Content="28" />

                <ComboBoxItem Content="36" />

                <ComboBoxItem Content="48" />

                <ComboBoxItem Content="72" />



        <RichTextBox Height="136" Name="RichTextBox2" Width="289" Canvas.Left="27"Canvas.Top="115" />




Now double click on the button Bold Button and add the following code.

Private Sub makeBold_Click(ByVal sender As System.ObjectByVal e AsSystem.Windows.RoutedEventArgsHandles makeBold.Click

        If Not [String].IsNullOrEmpty(RichTextBox2.Selection.Text) Then

            RichTextBox2.Selection.ApplyPropertyValue(Run.FontWeightProperty, FontWeights.Bold)

        End If

    End Sub

Now double click on the button Italic Button and add the following code.

Private Sub makeItalic_Click(ByVal sender As System.ObjectByVal e AsSystem.Windows.RoutedEventArgsHandles makeItalic.Click

        If Not [String].IsNullOrEmpty(RichTextBox2.Selection.Text) Then

            RichTextBox2.Selection.ApplyPropertyValue(Run.FontStyleProperty, FontStyles.Italic)

        End If

    End Sub


Now double click on the button Underline Button and add the following code.

Private Sub makeUnderline_Click(ByVal sender As System.ObjectByVal e AsSystem.Windows.RoutedEventArgsHandles makeUnderline.Click

        If Not [String].IsNullOrEmpty(RichTextBox2.Selection.Text) Then


        End If

    End Sub


Now double click on the button Font Button and add the following code.

Private Sub selectFontSize_SelectionChanged(ByVal sender As System.ObjectByVal e AsSystem.Windows.Controls.SelectionChangedEventArgs)

 Handles selectFontSize.SelectionChanged

        If RichTextBox2 IsNot Nothing AndAlso RichTextBox2.Selection.Text.Length > 0 Then

            RichTextBox2.Selection.ApplyPropertyValue(Run.FontFamilyProperty, NewFontFamily(TryCast(selectFontSize.SelectedItem,


        End If

    End Sub


Now save and run the application.


Figure 3.

Now select some word and click on the B Button that means Bold.


Figure 4.

Now again select and press Italic Button.


Figure 5.

Now again select and press Underline Button Button.


Figure 6.


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