net47 
namespace System.Web.Mvc
{
    public class AjaxHelper
    {
        public AjaxHelper(ViewContext viewContext, IViewDataContainer viewDataContainer, RouteCollection routeCollection);
    }
}
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Reference this API
.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net47
Assembly

System.Web.Mvc , Version=5.3.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.Mvc.

Package Microsoft.AspNet.Mvc (5.3.0) net45
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API