本文详细介绍了在将项目从Visual Studio 2008升级到Visual Studio 2010后遇到的关于System.Web.Extensions的类型歧义错误。通过右击网站项目选择属性页面然后移除System.Web.Extensions，成功解决了此问题。
**Error 1 The type 'System.Web.Compilation.WCFBuildProvider' is ambiguous: it could come from assembly 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Extensions\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Extensions.dll' or from assembly 'C:\Windows\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll'. Please specify the assembly explicitly in the type name. App_WebReferences/**
Today we upgrade our project from vs2008 to vs2010.
then i get the error.
when i search it by google i don't get the answer.
so i try to slove it by myself. i get it.
Right click the web site project and choice "Property pages" then remove system.web.extensions.
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