HtmlHelper.AntiForgeryToken Method ()
Generates a hidden form field (anti-forgery token) that is validated when the form is submitted.
Assembly: System.Web.Mvc (in System.Web.Mvc.dll)
The anti-forgery token can be used to help protect your application against cross-site request forgery. To use this feature, call the AntiForgeryToken method from a form and add the ValidateAntiForgeryTokenAttribute attribute to the action method that you want to protect.