Base64 でエンコードされた画像文字列を ASP.NET の画像に変換する方法

protected void SaveMyImage_Click(object sender, EventArgs e)
{
    // Get the Base64 encoded image string from the hidden input field
    string base64ImageString = Hidden1.Value;

    // Convert the Base64 string to binary data
    byte[] imageBytes = Convert.FromBase64String(base64ImageString);

    // Create a memory stream from the binary data
    using (MemoryStream ms = new MemoryStream(imageBytes))
    {
        // Create an Image object from the memory stream
        Image image = Image.FromStream(ms);

        // Save the image to the specified location
        string saveLocation = Server.MapPath("~/PictureUploads/whatever2.png");
        image.Save(saveLocation);
    }
}

// Create a memory stream from the binary data
using (MemoryStream ms = new MemoryStream(imageBytes))
{
    // Save the image to the memory stream
    image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); // Replace "Png" with the appropriate image format

    // Create an Image object from the memory stream
    image = Image.FromStream(ms);

    // Dispose the memory stream
    ms.Dispose();
}