passing value razor to controller

Just match your object name ,it should be same.

[HttpGet]
        public ActionResult Index()
        {
            DataModel d = new DataModel();
            d.LastName = "HiddenLast";
            return View(d);
        } 

[HttpPost]
        public ActionResult Index(DataModel model)
        {
            if (ModelState.IsValid)
            {
                model.Name = "new value";
                ModelState.Clear();
                return View(model);
            }
         
            return View(model);
        }



Html:


@model ValidationsMvc.Models.DataModel

@{
    ViewBag.Title = "Index";
}

Index

@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{

   

---

    @Html.ValidationSummary(true)
   

---

   

       
            @Html.HiddenFor(model => model.LastName)
       
   

   

        @Html.LabelFor(model => model.Name)
       
            @Html.EditorFor(model =>model.Name)
       
        @Html.ValidationMessageFor(model => model.Name)

   

 
}