单击mvc4中的按钮时不显示验证消息

我已经创建了一个登录页面，如果用户没有在点击按钮时输入用户名和密码，我希望它显示验证消息，我已经编写了如下代码

Homecontroller.cs

  public ActionResult Login()
    {
        // ViewBag.Message = "Your contact page.";
        return View();
    }

    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public ActionResult Login(logintable p)
    {
       abEntities db = new abEntities();
        List<sp_logindata_Result> data = db.sp_logindata(p.Username, p.Password).ToList();
        Session["LogedUserID"] = data.First().UserID.ToString();
        Session["UserNme"] = data.First().FullName.ToString();
        int typeVal = data.First().Usertype;
        if (typeVal == 1)
        {
            return RedirectToAction("page1");
        }
        else if (typeVal == 2)
        {
            return RedirectToAction("page2");
        }
        else
        {
            return RedirectToAction("Error");
        }

        return View(data);
    }

loginable.cs

 public partial class logintable
{
    public logintable()
    {
        this.PerformanceDetails = new HashSet<PerformanceDetail>();
        this.EvaluationDetails = new HashSet<EvaluationDetail>();
    }
    public string FullName { get; set; }
     [Required(ErrorMessage = "Employee name is required")]
    public string Username { get; set; }
     [Required(ErrorMessage = "Password is required")]
    public string Password { get; set; }
    public virtual ICollection<PerformanceDetail> PerformanceDetails { get; set; }
    public virtual ICollection<EvaluationDetail> EvaluationDetails { get; set; }
}

login.cshtml

@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<div>
    <fieldset>
        <legend>Login</legend>
        <div class="editor-field">
            @Html.TextBoxFor(u => u.Username)
            @Html.ValidationMessageFor(u => u.Username)
        </div>
        <div class="editor-label">
            @Html.LabelFor(u => u.Password)
        </div>
        <div class="editor-field">
            @Html.PasswordFor(u => u.Password)
            @Html.ValidationMessageFor(u => u.Password)
        </div>
        <input type="submit" value="Log In" />
    </fieldset>
</div>

}

我在这里错过了什么，所以它没有显示消息。