HtmlString vs. MvcHtmlString

Question

HtmlString vs. MvcHtmlString

What are the differences bettween those two, or when to prefer one over the other?

Edit:

Answer 1

MvcHtmlString is used to indicate when a string should not be re-encoded.

See What is an MvcHtmlString and when should I use it?

and

What does <%: %> do in ASP.NET (MVC2)?