This post is related to IIS server and ASP.NET. Before start steps to create. I want to talk about "sub web site under root web site". For example :- We created one asp.net web site using  own code/CMS. So, for some functionality  we planned to use some other asp.net CMS/ our custom code sites. So, we can create those sites under root web site. This we can get easily  by creating virtual directory under root web site. But the problem is, we will get some error when we run sub web site. Like ...