如何在MVC中验证带有数据注解的HTML控件？

public class UserModel
{
    [Required(ErrorMessage = "用户名是必填项")]
    [StringLength(50, MinimumLength = 3, ErrorMessage = "用户名长度必须在3到50个字符之间")]
    public string Username { get; set; }

    [Required(ErrorMessage = "密码是必填项")]
    [DataType(DataType.Password)]
    public string Password { get; set; }
}

@model UserModel

@using (Html.BeginForm())
{
    @Html.LabelFor(m => m.Username)
    @Html.TextBoxFor(m => m.Username)
    @Html.ValidationMessageFor(m => m.Username)

    @Html.LabelFor(m => m.Password)
    @Html.PasswordFor(m => m.Password)
    @Html.ValidationMessageFor(m => m.Password)

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

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Index(UserModel model)
    {
        if (ModelState.IsValid)
        {
            // 验证通过，执行其他操作
            return RedirectToAction("Success");
        }

        // 验证失败，重新显示视图
        return View(model);
    }

    public ActionResult Success()
    {
        return View();
    }
}