gistfile1.txt

[POST]
        public JsonResult UploadImage(HttpPostedFileBase uploadedFile)
        {
            var cloudinary = new CloudinaryDotNet.Cloudinary(ConfigurationManager.AppSettings.Get("cloudinary_url"));
            bool isValidImage;

            if (uploadedFile != null)
            {
                isValidImage = uploadedFile.IsValidImage(250, 250);
            }
            else
            {
                // TODO: actions if close button pressed
                return null;
            }

            if (isValidImage)
            {
                uploadedFile.InputStream.Seek(0, SeekOrigin.Begin);

                var uploadParams = new CloudinaryDotNet.Actions.ImageUploadParams()
                {
                    File = new CloudinaryDotNet.Actions.FileDescription("filename", uploadedFile.InputStream),
                };

                var uploadResult = cloudinary.Upload(uploadParams);
                string avatarUrl = cloudinary.Api.UrlImgUp.Transform(new CloudinaryDotNet.Transformation().Width(500).Height(500).Crop("limit")).BuildUrl(String.Format("{0}.{1}", uploadResult.PublicId, uploadResult.Format));

                return Json(new { avatarUrl = avatarUrl, avatarId = uploadResult.PublicId, avatarFormat = uploadResult.Format });
            }

            return Json();
        }