当选中复选框时，如何关闭MVC中字段的必需验证？

Question

这在我的模型中是什么：

    public CheckBoxListItem Same { get; set; }  

    [Required(ErrorMessage = "* Billing Name field is required")]
    public string BillingName { get; set; }

这就是我认为：

            @Html.LabelFor(model => model.Same.IsChecked, "Billing Is Same As Shipping")
            @Html.HiddenFor(model => model.Same.Text)
            @Html.CheckBoxFor(model => model.Same.IsChecked)
        </div> 
        <h3>Billing Information</h3>
        <div>
            @Html.LabelFor(model => model.BillingName, "Name")
            @Html.EditorFor(model => model.BillingName)
            @Html.ValidationMessageFor(model => model.BillingName)  
        </div>

选中该复选框后，我希望在提交表单时不再需要BillingName所需的验证。我如何在MVC中执行此操作？