从asp.net项目中删除未使用的文件/图像

My question is somewhat different. Currently I am working on asp.net web project in which I have many images and html pages, out of which i am using very few. Now want to delete unused out of them but need to check every aspx/htm/master page whether i used them or not. So is there any way i come to know that which files are unused ? Is there any tool for it ? or any thing i come to know while build/compile project ? Thanks in advance.My question is somewhat different. Currently I