Adds a piece of content to user's favorites. 

This method can be accessed through the Favorites.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/Favorites.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "AddContentFavorite", Description = "Adds a piece of content to user's favorites.")]
public void AddContentFavorite(long contentId, long userId);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "AddContentFavorite", Description = "Adds a piece of content to user's favorites.")>
Public Function AddContentFavorite(contentId As long, userId As long) As void