问MVC中的数据验证不起作用

EN

I have the following in the ViewModel:

    [DataMember(EmitDefaultValue = false)]
    [Required(ErrorMessage="CompanyName is Required")]
    [StringLength(40, ErrorMessage = "Must be under 40 characters")]
    public string CompanyName { get; set; }

<appSettings>
    <add key="Location" value="Test"/>
    <add key="ClientValidationEnabled" value="true"/>
    <add key="UnobtrusiveJavaScriptEnabled" value="true"/>
</appSettings>

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.min.js"></script>
    <script src="http://ajax.aspnetcdn.com/ajax/mvc/3.0/jquery.validate.unobtrusive.min.js"></script>


<div>
        <%= Html.TextBoxFor(c => c.CompanyName, new { style = "width:300px"})%>
        <%=Html.ValidationMessageFor (c=>c.CompanyName) %>
        </div>

<div>
<input id="CompanyName" maxlength="40" name="CompanyName" style="width:300px" type="text" value="" />
<span class="field-validation-valid" data-valmsg-for="CompanyName" data-valmsg-replace="true"></span>

[HttpPost]
public ActionResult Save(EmailModel model)
{
    if (ModelState.IsValid)
    {
        Helper.Save(model);
        return Json(JsonEnvelope.Succes());
    }
    return View(model);
}