C# generate thumbnailimage via System.Drawing

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows; 
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input; 
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Drawing;
using System.IO;
using System.Reflection;

namespace WpfApp294
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            ThumbDemo();
        }

        private void ThumbDemo()
        {
            var imgsList = System.IO.Directory.GetFiles(@"../../Images");
            int imgsCount = imgsList.Count();
            string destDir = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "ThumbImages");
            if(!Directory.Exists(destDir))
            {
                Directory.CreateDirectory(destDir);
            }
            for (int i=0;i<imgsCount; i++)
            {
                using(FileStream fs=new FileStream(imgsList[i], FileMode.Open, FileAccess.Read))
                {
                    Image originalImg = Image.FromStream(fs);
                    int thumbWidth=100, thumbHeight=100;
                    Image thumbImg=originalImg.GetThumbnailImage(thumbWidth, thumbHeight,null,IntPtr.Zero);
                    string thumbFile = System.IO.Path.Combine(destDir, $"{System.IO.Path.GetFileNameWithoutExtension(imgsList[i])}_thumb.jpg");
                    thumbImg.Save(thumbFile);
                }
            }
        }
    }
}