如何让Visual Studio 2012检测是否需要重新映射虚拟目录？

My situation:
I am working on an ASP.NET MVC project and debug in IIS-Express. Sometimes when we create a temporary branch, this branch will use the same port for debugging. This means the virtual directory in IIS is the same and I can't run them both at the same time. I am working on an ASP.NET MVC pr