public IEnumerable<MvcInternetShop.Models.DomainModels.Group> Groups { get; set; }
    public MvcInternetShop.Models.DomainModels.Group Group { get; set; }

public ActionResult AddGroup(Group model)
    {

        if (ModelState.IsValid)
        {


            if (gr.Add(model)) // gr is a GroupRepository for CRUD.
                return JavaScript("notif({type: 'info',msg: 'Your Group Registerd.',width: 'all',height: 100,position: 'center'});");
            else
                return JavaScript("notif({type: 'error',msg: 'Error.Try again!.',width: 'all',height: 100,position: 'center'});");

        }
        else
        {
            return JavaScript("notif({type: 'error',msg: '" + ModelState.GetErrors() + "',width: 'all',height: 100,position: 'center',modal:true});");//GetError() is a  myExtension method.
        }
    }

@using (Ajax.BeginForm("AddGroup", "Admin", new AjaxOptions { HttpMethod="Post",Url="/Admin/AddGroup"}))
{
        @Html.TextBoxFor(p=>Model.Group.Name)//Model is a viewmodel that contains Group and Groups property.
        @Html.ValidationMessageFor(p => Model.Group.Name)
        <button type="submit" class="button">Add group</button>}