WPF OpenFielDialog Filter InitialiaDirectory Title

//xaml
<Window x:Class="WpfApp189.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:WpfApp189"
        mc:Ignorable="d" WindowState="Maximized"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Button Content="Open Image" FontSize="20" Click="OnOpenImage"
                HorizontalAlignment="Center" Margin="4"/>
        <Image Grid.Row="1" x:Name="img" Stretch="Uniform"/>
    </Grid>
</Window>


using System;
using System.Collections.Generic;
using System.ComponentModel.Design.Serialization;
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 Microsoft.Win32;

namespace WpfApp189
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void OnOpenImage(object sender, RoutedEventArgs e)
        {
            var dlg = new OpenFileDialog()
            {
                Filter = "Image files|*.png;*.jpg;*.gif;*.bmp|All Files|*.*",
                Title = "Select image to open",
                InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop)
            };
            if(dlg.ShowDialog()==true)
            {
                try
                {
                    var bmp = new BitmapImage(new Uri(dlg.FileName));
                    img.Source = bmp;
                }
                catch(Exception ex)
                {
                    MessageBox.Show(ex.Message, "Open Image");
                }
            }
        }
    }
}

//cs