#region convert image to base64

public string ImageToBase64(Image image, System.Drawing.Imaging.ImageFormat format)

{

    using (MemoryStream ms = new MemoryStream())

    {

        // Convert Image to byte[]

        image.Save(ms, format);

        byte[] imageBytes = ms.ToArray();

        // Convert byte[] to Base64 String

        string base64String = Convert.ToBase64String(imageBytes);

        return base64String;

    }

}

#endregion