public static void AppendUnorderedList(this StringBuilder stringBuilder, string listContents)
 {
     stringBuilder.AppendTag("ul", listContents);
 }
 public static void AppendListItem(this StringBuilder stringBuilder, string listItem)
 {
     stringBuilder.AppendTag("li", listItem);
 }
 public static void AppendListItem(this StringBuilder stringBuilder, string listItem, object attributes)
 {
     stringBuilder.AppendTag("li", listItem, attributes);
 }
 public static void AppendTag(this StringBuilder stringBuilder, string tagName, string content)
 {
     stringBuilder.AppendTag(tagName, content, new { });
 }