Reading Image Headers to Get Width and Height

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace DevWilson
{
    class Tests
    {
        public static int Test1(string imagesFolder)
        {
            List<string> imagePaths = new List<string>(Directory.GetFiles(imagesFolder, "*.jpg", SearchOption.AllDirectories));

            ImageOrientationSlow slow = new ImageOrientationSlow();
            List<string> landscapes = new List<string>();

            foreach (string imagePath in imagePaths)
            {
                if (slow.IsLandscape(imagePath))
                {
                    landscapes.Add(imagePath);
                }
            }

            return landscapes.Count;
        }

        public static int Test2(string imagesFolder)
        {
            List<string> imagePaths = new List<string>(Directory.GetFiles(imagesFolder, "*.jpg", SearchOption.AllDirectories));

            ImageOrientationThreaded threaded = new ImageOrientationThreaded();

            threaded.GetLandscapeThreaded(imagePaths);
            List<string> landscapes = threaded.Landscapes;

            return landscapes.Count;
        }

        public static int Test3(string imagesFolder, string cachePath)
        {
            ImageList images = new ImageList(cachePath);

            if (File.Exists(cachePath))
            {
                ImageListToXml.LoadFromXml(cachePath, images);
            }

            ImageFolderQuickCheck.QuickCheck(images, imagesFolder);

            return images.Count(i => i.Orientation == ImageOrientation.Landscape);
        }
    }
}