I have the same problem as below:
ASP.NET MVC 3 ValidateRequest(false) not working with FormCollection
I have tried to add a reference to the System.We
System.We
The Unvalidated() extension method is defined in the System.Web.WebPages.dll assembly, not System.Web.Helpers.dll (but still in the System.Web.Helpers namespace)
Unvalidated()
System.Web.WebPages.dll
System.Web.Helpers.dll
System.Web.Helpers
Sorry for the confusion.