MVC 4-Return error message from Controller -Show in View

Question

I doing a C# project using Razor in VS2010.(MVC 4).

I need to Return error message from Controller to View and show it to User.

What i was tried is:

CONTROLLER:

 [HttpPost]

        public ActionResult form_edit(FormModels model)

        {          

            model.error_msg = model.update_content(model);           

            ModelState.AddModelError("error", "adfdghdghgdhgdhdgda");

            ViewBag.error = TempData["error"];

         return RedirectToAction("Form_edit", "Form");

          

        }

VIEW:

@model mvc_cs.Models.FormModels

@using ctrlr = mvc_cs.Controllers.FormController

 @using (Html.BeginForm("form_edit", "Form", FormMethod.Post))

{

    

        <table>

        <tr>

        <td>       

        @Html.ValidationSummary("error")       

        @Html.ValidationMessage("error")      

        </td>

        </tr>

    <tr>

        <th>

            @Html.DisplayNameFor(model => model.content_name)

            @Html.DropDownListFor(x => x.selectedvalue, new SelectList(Model.Countries, Model.dd_value, Model.dd_text), "-- Select Product--")

           

        </th>

    </tr>

</table>

    

<table>

    <tr>

        <td>

            <input  type="submit" value="Submit" />

        </td>

    </tr>

</table>

}

Please help me to achieve this.

Please dont give ant links to read.