ASP MVC错误：对象引用未设置为对象的实例

My view

我的看法

<table>
                 <tr>
        <td>
            Middle Name : 
        </td>
        <td>
            @Html.EditorFor(model => @Model.EmployeeDetail.MiddleName)
        </td>
        <td>
            @Html.ValidationMessageFor(model => @Model.EmployeeDetail.MiddleName)
        </td>
    </tr>
    <tr>
        <td>
            Last Name : 
        </td>
        <td>
            @Html.EditorFor(model => @Model.EmployeeDetail.LastName)
        </td>
        <td>
            @Html.ValidationMessageFor(model => @Model.EmployeeDetail.LastName)
        </td>
    </tr>
    <tr>
        <td>
            Date of Birth  : 
        </td>
        <td>
            @Html.EditorFor(model => @Model.EmployeeDetail.DateOfBirth)
        </td>
        <td>
            @Html.ValidationMessageFor(model => @Model.EmployeeDetail.DateOfBirth)
        </td>
    </tr>
</table>
<table>
                 <tr>