tcc/ASP.NET/Services/ImageService.cs

namespace TCC.Services
{
    public class ImageService
    {
        public ImageService() { }

        public void SaveImage(Stream fileStream)
        {
            var file = File.Create("image.png");
            fileStream.CopyToAsync(file);
            file.Close();
        }

        public byte[] GetSimpleImage()
        {
            return File.ReadAllBytes("static/small-image.png");
        }

        public byte[] GetBigImage()
        {
            return File.ReadAllBytes("static/big-image.png");
        }
    }
}