public override string GetDesignTimeHtml()
{
var rating = _gravatar.Rating == GravatarRating.Default
? "G"
: _gravatar.Rating.ToString();
var gravatarDefaultImageUrl = ViewControl.Page.ClientScript.GetWebResourceUrl(
this.GetType(), "Gravatar.Images.gravatar-" + rating + ".jpg");
return String.Format("<div style='width:80px; height:80px;'><img src='{0}'/></div>", gravatarDefaultImageUrl);
}