WPF: How add check mark to the textblock?

You can use the SQUARE ROOT character in either in XAML or code-behind to achieve a check mark symbol:

XAML:

<StackPanel>    <TextBlock Text="√"/>    <TextBox Text="√"/>    <Label Content="√"/></StackPanel>

Code-behind:

txtBoxName.Text = "\x221A";

just refer this document by Josh smith about Differences between Label and TextBlock

http://joshsmithonwpf.wordpress.com/2007/07/04/differences-between-label-and-textblock/

I think you can do by using Label

<Label>   <StackPanel Orientation="Horizontal"> <Path                                 Width="11" Height="11"                                 SnapsToDevicePixels="False"                                 Stroke="red"                                StrokeThickness="2"                                Data="M 2,4 C 2,4 3,5 5,13 C 5,13 5,3 12,0" />                                <TextBlock Margin="5,0,0,0">Successfully Completed!</TextBlock>                                </StackPanel>                                </Label></StackPanel>

<StackPanel Orientation="Horizontal">   <TextBlock Text="&#xE10B;" FontFamily="Segoe MDL2 Assets" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="40"/>   <Border Width="10"/>   <TextBlock Text="Checkmark!" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="40"/></StackPanel>