I have Sitecore8.1 MVC with Glass.Mapper.Sc package (from NuGet) installed. I need to use the 'Editable' method in my cshtml, but I keep getting a runtime error:
The name 'Editable' does not exist in the current context
Do I need other DLLs, or usings or config updates etc..?
You have to use it in a Controller Rendering and not a View Rendering. Its in the Glass.Mapper.Sc.Web.Mvc.GlassView class. See this link for a working example.
http://www.seanholmesby.com/sitecore-mvc-page-editor-friendly-views-with-glass-mapper/