private void Upload_Click(object sender, RoutedEventArgs e)
        {
            Random    randomName = new Random();
            FileModel fileModel  = new FileModel
            {
                Id       = new Guid(),
                Name     = "MyPhoto" + randomName.Next().ToString(),
                DateTime = DateTimeOffset.Now,
                Photo    = Convert.ToBase64String(image)
            };

            FileSender client = new FileSender(url);

            client.AddFile(fileModel);

            MessageBox.Show("File has been uploaded");
        }
        private async void Get_Click(object sender, RoutedEventArgs e)
        {
            FileSender client = new FileSender(url);

            string[] formats = { "N", "D", "B", "P", "X" };
            Guid     result;

            try
            {
                Guid.TryParseExact(txtId.Text, "D", out result);
                var files = await client.GetFileAsync(result);

                var buffer = Convert.FromBase64String(files.Photo);
                imgPhoto.Source = ByteToImage(buffer);
            }
            catch (NullReferenceException err)
            {
                MessageBox.Show(err.Message);
            }
        }