Programatically create directory for new user on web site

Question

I just uploaded my site to Go Daddy and have code that creates a directory dynamically based on a user id when the user creates an account on my site. It's not creating the directory so I suppose I need to set permissions in some way but I don't have control over IIS since my site's being hosted. How do I programatically set permissions?

if(Directory.Exists(path))
                return true;

try
{
    Directory.CreateDirectory(path);
}