IE10 IE11 .Net4 aspnet 验证控件失效 server 2003 IIS6 “__doPostBack”未定义

        最近部署asp.net网站到windows server 2003下，IE11浏览网站时，验证控件失效!  火狐和欧朋浏览器正常显示。

“查看源”，验证控件未出现。

其它问题：在 IE 11 下<asp:LinkButton> 点击出现 “__doPostBack”未定义”，

原因：

ASP.NET 可能无法辨识出一些浏览器的最新版本，还会经常把它们看做是低级的浏览器。（也就是： 不支持JavaScript。） 
详见： http://blogs.msdn.com/b/scott_hanselman/archive/2011/10/28/asp-net-ie10-dopostback-javascript-ff5.aspx 
本人按照该文所提供的解决办法始终未能得到解决，于是按提示尝试用单个站点的方式修复。 
1、在项目根目录新建： App_Browsers 文件夹

2、在App_Browsers 文件夹下新建文件： “浏览器文件.browser”

     让其与IE11的 UserAgent 匹配，使 .net framework 认识这是一个已知的浏览器，可以正常地向客户端输出脚本。 

在文件里输入以下内容，保存即可。

<browsers>
<browser id="IE11" parentID="Mozilla">
<identification>
<userAgent match="Trident\/7.0; rv:(?'version'(?'major'\d+)(\.(?'minor'\d+)?)(?'letters'\w*))(?'extra'[^)]*)" />
<userAgent nonMatch="IEMobile" />
</identification>
<capture>
<userAgent match="Trident/(?'layoutVersion'\d+)" />
</capture>
 <capabilities>
 <capability name="browser" value="IE" />
 <capability name="layoutEngine" value="Trident" />
 <capability name="layoutEngineVersion" value="${layoutVersion}" />
 <capability name="extra" value="${extra}" />
 <capability name="isColor" value="true" />
 <capability name="letters" value="${letters}" />
 <capability name="majorversion" value="${major}" />
 <capability name="minorversion" value="${minor}" />
 <capability name="screenBitDepth" value="8" />
 <capability name="type" value="IE${major}" />
 <capability name="version" value="${version}" />
 </capabilities>
 </browser>

 <!-- Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11,0) like Gecko -->
 <browser id="IE110" parentID="IE11">
 <identification>
 <capability name="majorversion" match="11" />
 </identification>

 <capabilities>
 <capability name="ecmascriptversion" value="3.0" />
 <capability name="jscriptversion" value="5.6" />
 <capability name="javascript" value="true" />
 <capability name="javascriptversion" value="1.5" />
 <capability name="msdomversion" value="${majorversion}.${minorversion}" />
 <capability name="w3cdomversion" value="1.0" />
 <capability name="ExchangeOmaSupported" value="true" />
 <capability name="activexcontrols" value="true" />
 <capability name="backgroundsounds" value="true" />
 <capability name="cookies" value="true" />
 <capability name="frames" value="true" />
 <capability name="javaapplets" value="true" />
 <capability name="supportsCallback" value="true" />
 <capability name="supportsFileUpload" value="true" />
 <capability name="supportsMultilineTextBoxDisplay" value="true" />
 <capability name="supportsMaintainScrollPositionOnPostback" value="true" />
 <capability name="supportsVCard" value="true" />
 <capability name="supportsXmlHttp" value="true" />
 <capability name="tables" value="true" />
 <capability name="supportsAccessKeyAttribute" value="true" />
 <capability name="tagwriter" value="System.Web.UI.HtmlTextWriter" />
 <capability name="vbscript" value="true" />
 </capabilities>
 </browser>
 </browsers>