使用IIs6或IIs7的命令行更改IIS中虚拟目录或站点的物理路径

I need to implement some versioning for deployment for the app I support where I can copy the site to say c:\inetpub\wwwroot\app_v2 and then switch the virtual directory from c:\inetpub\wwwroot\app_v1.I need to implement some versioning for deploym