Label

A Label displays text. We can dynamically change the Content of a Label. The Label_Loaded event handler allows to changes its attributes at WPF program startup.

First, please create a new WPF project, and drag a Label to the designer window. Next change the markup of the XAML file—this is where the controls are specified.

Label example

Here we create the Label_Loaded event. Please type "Label" into the XAML file and then have Visual Studio auto-generate the C# event handler.

<Window x:Class="WpfApplication4.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>
        <Label
            Content="Label"
            HorizontalAlignment="Stretch"
            Margin="10,10,10,10"
            VerticalAlignment="Center"
            Background="Beige"
            Padding="5"
            FontSize="30"
            Loaded="Label_Loaded"/>
    </Grid>
</Window>
using System;
using System.Windows;
using System.Windows.Controls;

namespace WpfApplication4
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Label_Loaded(object sender, RoutedEventArgs e)
        {
            // ... Get label.
            var label = sender as Label;
            // ... Set date in content.
            label.Content = DateTime.Now.ToShortDateString();
        }
    }
}

Loaded

Why do we use the Label_Loaded event handler to assign a value to the Label? A static (constant) label can be assigned directly within the XAML.

TextBlock, Label

What is the difference between the TextBlock element and the Label element? The TextBlock element by default has attributes for longer text.

In a WPF program, the need to use visual, text labels on controls is common. We used the Label control and its Label_Loaded event.