net481 
namespace System.Web.Mvc.Ajax
{
    public static class AjaxExtensions
    {
        public static MvcForm BeginForm(this AjaxHelper ajaxHelper, string actionName, AjaxOptions ajaxOptions);
    }
}
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.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
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
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