请问这是什么错误，该如何解决？

[madBT]

本人初学.net,下载了一个源程序，IIS中已经设置好，打开后出现如下错误，请问是何原因？如何解决？

Server Error in '/test' Application.
--------------------------------------------------------------------------------

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: File or assembly name Microsoft.Web.UI.WebControls, or one of its dependencies, was not found.

Source Error:


Line 1: <%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
Line 2: <%@ Page language="c#" Codebehind="index.aspx.cs" AutoEventWireup="false" Inherits="Test.WebForm1"%>
Line 3: <%@ Register TagPrefix="cr" Namespace="CrystalDecisions.Web" Assembly="CrystalDecisions.Web, Version=9.1.5000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304" %>


Source File: E:\test\index.aspx Line: 1

[madBT]

up

[老戴12345654]

是不是使用了TreeView,拷贝Microsoft.Web.UI.WebControls.dll到bin目录
或者重新下载安装
http://www.microsoft.com/china/msdn/archives/library/dnaspp/html/aspnet-usingtreeviewiewebcontrol.asp

[fengfangfang]

没有安装Microsoft.Web.UI.WebControls

[madBT]

我已经下载安装了，可还是一样的错误，还会有别的什么问题吗？

[madBT]

up