如何使我的ModelState在字段为空的情况下有效？

public class MyModel
{
    [Required]
    public string Name { get; set; }
}

[HttpPost]
public ActionResult MyAction(MyModel model)
{
    if (ModelState.IsValid)
    {
        // 模型验证成功，执行相应的操作
        // ...
        return RedirectToAction("Success");
    }

    // 模型验证失败，重新显示表单并提示错误信息
    return View(model);
}

@model MyModel

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

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