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No selected items in the ListBoxFor should show validation error in asp.net mvc
[HttpGet]
        public ActionResult Delete()
        {
            var templates = _templateDataProvider.GetTemplates();
            var listViewModel = new ListViewModel<Template>();
            listViewModel.DisplayList = templates;
            return PartialView(listViewModel);
        }

        [HttpPost]
        public ActionResult Delete(int[] selectedIds)
        {
            if (selectedIds == null)
            {
                ModelState.AddModelError("Name", "Nothing selected");
            }

            if (ModelState.IsValid)
            {
                return Json(new { success = true });
            }

            return PartialView();
        }

@model ITMS.ViewModels.ListViewModel<ITMS.Models.Template>
<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
@using (Html.BeginForm("Delete", "Template"))
{
    @Html.ValidationSummary(false)
    @Html.ListBoxFor(x => x.SelectedIds, new SelectList(Model.DisplayList, "Id", "Name"),new { @class = "select"} )
}

return PartialView(new ListViewModel<Template> { DisplayList = _templateDataProvider.GetTemplates() });

var templates = _templateDataProvider.GetTemplates();
var listViewModel = new ListViewModel<Template>();
listViewModel.DisplayList = templates;
return PartialView(listViewModel);

[HttpPost]
public ActionResult Delete(ListViewModel<Template> model)
{
    if (ModelState.IsValid)
    {
        return Json(new { success = true });
    }

    // Make sure you rebind the DisplayList property
    model.DisplayList = _templateDataProvider.GetTemplates();
    return PartialView(model);
}

[Required]
public IEnumerable<Template> SelectedIds { get; set; }

public IEnumerable<Template> GetTemplates()
{
    var templates = HttpContext.Cache["templates"] as IEnumerable<Template>;
    if (templates == null)
    {
        templates = _templateDataProvider.GetTemplates();
        HttpContext.Cache["templates"] = templates;
    }
    return templates;
}

public ActionResult Delete()
{
    var listViewModel = new ListViewModel<Template>();
    listViewModel.DisplayList = GetTemplates();
    return PartialView(listViewModel);
}

[HttpPost]
public ActionResult Delete(ListViewModel<Template> model)
{
    if (ModelState.IsValid)
    {
        return Json(new { success = true });
    }

    model.DisplayList = GetTemplates();
    return PartialView(model);
}