Bind Slider to TextBlock
<UserControl x:Class='SilverlightApplication3.MainPage' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' xmlns:d='http://schemas.microsoft.com/expression/blend/2008' xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' mc:Ignorable='d' d:DesignWidth='640' d:DesignHeight='480'> <StackPanel x:Name="LayoutRoot" Background="White"> <TextBlock x:Name="myValue" Height="32" Width="auto" FontSize="14" Text="{Binding Value, Mode=OneWay, ElementName=mySlider}"></TextBlock> <Slider x:Name="mySlider" Maximum="100" Minimum="1" Value="5"></Slider> </StackPanel> </UserControl>