If you want to run a site using Web Pages version 1 (instead of the default, as in the previous point), you can configure the site to do that. If your site doesn‘t already have a web.config file in the root of the site, create a new one and copy the following XML into it, overwriting the existing content. If the site already contains aweb.config file, add an <appSettings> element like the following one to the <configuration> section.
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="webPages:Version" value="1.0"/>
</appSettings>
</configuration>
Web Pages version 2兼容 Web Pages version 1的设置
原文：http://www.cnblogs.com/imust2008/p/4272711.html