在调试任何更新时更新.css文件。 ASP.NET MVC 2

I created an MVC 2 Project. When I am Changing the attributes of an id on the Site.css nothing changes on the view. For example I changed the color:White to Color : Red. Run the Application nothing happens. I have already cleared the cache of my IE and also press F5 as I saw in another post but it didn't help. I know this is a very simple question but if someone can help me it would be great. Below is the code I created an MVC 2 Project. When I am Changing