Attribute to sleect form in sitecore mvc

gistfile1.txt

using System.Web.Mvc;

namespace xx.Site.Infrastructure
{
    public class FormButtonAttribute : ActionMethodSelectorAttribute
    {
        private readonly string _name;

        public FormButtonAttribute(string name)
        {
            _name = name;
        }

        public override bool IsValidForRequest(ControllerContext controllerContext, System.Reflection.MethodInfo methodInfo)
        { 
            return controllerContext.HttpContext.Request.IsAjaxRequest() 
                || !string.IsNullOrEmpty(controllerContext.HttpContext.Request.Form[_name]);
        }
    }
}