为什么在使用ASP.NET EF6自动创建的控制器和视图时需要所有字段

Question

我是ASP.NET EF6的新手，需要一些帮助，我创建了一个datamodel和一个datacontext

public class RepositoryDbContext : DbContext
{
    public RepositoryDbContext()
        : base("DefaultConnection")
    {

    }

    public DbSet<Repository> Repositories { get; set; }
}

public class Repository
{
    public int ID { get; set; }
    public string SKU { get; set; }
    public string Title { get; set; }
}

和html页面

@using (Html.BeginForm()) 
{
@Html.AntiForgeryToken()

<div class="form-horizontal">
    <h4>Order</h4>
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(model => model.SKU, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.SKU, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.SKU, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.Title, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Title, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="Create" class="btn btn-default" />
        </div>
    </div>
</div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

然后我使用Visual Studio 2015自动创建控制器和视图，但是在创建页面中，sku和title都是必需的，我怎么能摆脱Title字段所需的验证。

非常感谢，我尝试使用谷歌搜索但没有运气。