如何防止Visual Studio 2005的“清理”命令删除第三方二进制文件？

I have a Sitecore/ASP.NET projects that I'm developing. Today at some point I inadvertently hit the "Clean" option in the solution context menu. It took me a while to figure out why my site was hopelessly broken. Turns out Visual Studio went ahead and deleted several required assemblies from the \bin dir which are not part of my project.I have a Sitecore/ASP.NET projects that I'm dev