ASP.NET MVC 4上的模式弹出窗口中的必需属性不起作用

Question

我的弹出窗口出现，当TextBox为空时，必须在弹出窗口中显示必需的消息，但它不会出现。我使用DataAnnotaion

这是我的观看代码：

@model BLL.Boards
@{

AjaxOptions ajaxOptions = new AjaxOptions
{
    UpdateTargetId = "Board_list",
    LoadingElementId = "loading",
    LoadingElementDuration = 1000,
    OnComplete = "closeDialog('Board')"
};
 }
<fieldset>
<legend>Boards List</legend>
@using (Ajax.BeginForm("Edit", ajaxOptions))
{
      @Html.ValidationSummary(true)
      @Html.HiddenFor(model => model.BoardID)
    <table>
       <tr>
            <td>@Html.LabelFor(model => model.BoardName)</td>
            <td>@Html.EditorFor(model => model.BoardName)</td>
            <td>@Html.ValidationMessageFor(model => model.BoardName)</td>

        </tr>
       <tr>
            <td>@Html.LabelFor(model => model.BoardDescription)</td>
            <td>@Html.EditorFor(model => model.BoardDescription)</td>
            <td>@Html.ValidationMessageFor(model => model.BoardDescription)</td>
        </tr>


    </table>
    <input type="submit" class="btn btn-primary" value="Save" /> 
    <input type="button" class="btn btn-primary" value="Cancel"/>
   }
   </fieldset>