- References in solutions explorer > right click > Add reference
- Under Assemblies > Framework, search for “System.Web.Helpers” Double click
- System.Web.Helpers version 2.0.0.0 and click ok. Find the
- System.Web.Helpers you’ve just added > right click it > properties.
- Change “Copy Local” from false, to true
And now @Json.Encode should work.
Update