A TextBlock can contain a string in its Text property.
TextBlock is designed to be lightweight and is optimized for single-line display.
Example
<Window x:Class="TextBlock.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBlock Name="textBlock1"
TextWrapping="Wrap">
Simple text <Bold>Bold text</Bold> <Italic>Italic text</Italic>
</TextBlock>
</Grid>
</Window>
