如何在WPF窗口中隐藏关闭按钮？

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        WindowStyle="None" AllowsTransparency="True">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
       <Border Grid.Row="0" Background="White" MouseDown="Border_MouseDown">
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center">标题栏</TextBlock>
        </Border>
       <Border Grid.Row="1" Background="White" BorderBrush="Black" BorderThickness="1">
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center">窗口内容</TextBlock>
        </Border>
    </Grid>
</Window>

using System.Windows;
using System.Windows.Input;

namespace WpfApp1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Border_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (e.ChangedButton == MouseButton.Left)
            {
                DragMove();
            }
        }
    }
}