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HTTP Post request from different controller actions and ModelState
public class ProductController : Controller {

    [HttpPost]
    public ActionResult Search(SearchModel searchModel) {

        if (ModelState.IsValid) {
            //Do some stuff...

            return RedirectToAction("Index", "SearchResult");
        }
        return View(searchModel);
    }
}

public class SearchModel {

    [Required]
    public string ProductCategory { get; set; }

    [Required]
    public string ProductName { get; set; }
}

@model MvcApplication20.SearchModel

@using (Html.BeginForm("search", "product"))
{
    @Html.EditorForModel()

    <input type="submit" value="Search" />
}

@{
    ViewBag.Title = "Home Page";
}

<h2>@ViewBag.Message</h2>

@Html.Partial("_SearchPartialView")

[HttpPost]
public ActionResult Search(SearchModel searchModel) {

    if (ModelState.IsValid) {
        //Do some stuff...

        return RedirectToAction("Index", "SearchResult");
    }
    // since we are returning a view instead of a partial view,
    // the _SearchPartialView template should be displayed with the layout
    return View("_SearchPartialView", searchModel);
}

$(document).on('submit', '#searchForm', function() {
    $.ajax({
        url: this.action,
        type: this.method,
        data: $(this).serialize(),
        success: function(result) {
            if (result.redirectTo) {
                // no validation errors we can redirect now:
                window.location.href = result.redirectTo;
            } else {
                // there were validation errors, refresh the partial to show them
                $('#searchContainer').html(result);

                // if you want to enable client side validation
                // with jquery unobtrusive validate for this search form
                // don't forget to call the .parse method here
                // since we are updating the DOM dynamically and we
                // need to reattach client side validators to the new elements:
                // $.validator.unobtrusive.parse(result);
            }
        }
    });
    return false;
});

<div id="searchContainer">
    @Html.Partial("_SearchPartialView")
</div>

[HttpPost]
public ActionResult Search(SearchModel searchModel) {

    if (ModelState.IsValid) {
        //Do some stuff...

        return Json(new { redirectTo = Url.Action("Index", "SearchResult") });
    }
    return PartialView("_SearchPartialView", searchModel);
}