元素'CompositeBoundField'不是已知元素。 （尝试扩展BoundField服务器控件）

Question

VS2010，.Net 4.0

尝试扩展asp.net BoundField服务器控件时，如下所述：
http://iridescence.no/post/FixingBoundFieldSupportforCompositeObjects.aspx

我创建了一个类：

using System.Web.UI;
using System.Web.UI.WebControls;

namespace CustomControls
{ 
    public class CompositeBoundField : BoundField
    {
        protected override object GetValue(Control controlContainer)
        {
            object item = DataBinder.GetDataItem(controlContainer);
            return DataBinder.Eval(item, this.DataField);
        }
    }
}

我已经从我的页面注册了它：

<%@ Register TagPrefix="cc" Namespace="CustomControls" %>

...在该页面上，我试图像这样使用它：

<asp:GridView ID="gridDataSource" runat="server">
    <Columns>
        <cc:CompositeBoundField DataField="Application.ApplicationName" HeaderText="ApplicationName" />
    </Columns>
    </asp:GridView>

但是，我收到编译器警告：

Element 'CompositeBoundField' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing.    

当我跑步时，我收到错误：

Parser Error 
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

Parser Error Message: Unknown server tag 'cc:CompositeBoundField'.

任何想法我做错了什么？

我试过这个：
http://blog.tentaclesoftware.com/archive/2010/07/21/95.aspx

Answer 1

在注册声明中，大会是强制性的：

<%@ Register Namespace="CustomControls" TagPrefix="cc" Assembly="MyCompany.MyApp.WebApp" %>

Answer 2

检查Assembly属性是否包含完整的强名称，例如 Assembly =＆＃34; MyCompany.MyApp.WebApp，Version = 3.42.0.0，Culture = neutral，PublicKeyToken = 674cf0e5bf72fa08＆＃34;