WPF ListBox ListBox.ItemTemplate DataTemplate

<Window x:Class="WpfApp144.MainWindow"
        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"
        xmlns:local="clr-namespace:WpfApp144"
        mc:Ignorable="d" WindowState="Maximized"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <ListBox HorizontalAlignment="Stretch" ItemsSource="{Binding}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Border Margin="2" Padding="4" BorderBrush="Black" BorderThickness="1">
                        <StackPanel Orientation="Horizontal" TextBlock.FontSize="16">
                            <TextBlock Foreground="Black" FontWeight="Bold" 
                                       Text="{Binding ProcessName,StringFormat='Name:\{0\}\     '}"/>
                            <TextBlock Margin="10,0,0,0" Foreground="Blue" 
                                       Text="{Binding Id,StringFormat='Id:\{0\}\    '}"/>
                            <TextBlock Margin="20,0,0,0" Foreground="Red"
                                       Text="{Binding Threads.Count,StringFormat='Threads Count:\{0\}'}"/>
                        </StackPanel>
                    </Border>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <StackPanel Grid.Row="1" Orientation="Horizontal" Margin="4" TextBlock.FontSize="20">
            
        </StackPanel>
    </Grid>
</Window>


//cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Diagnostics;

namespace WpfApp144
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = Process.GetProcesses();
        }
    }
}