Support UrlEncoding for the C# implementation.
I have had several element when integrating with backend service APIs where the Authentication token and other properties need to be UrlEncoded. (ie SAS tokens, or redirect URL on query strings).
Normally in C# I would use the HttpUtility class (UrlEncod methods) but these are not available / supported classes in the custom policy section of the site.
Would be nice to have the HttpUtility class and some more of the Encoding classes available.