create directory in asp.net mvc

i want to create directory for save image.. my code is that

[HttpPost]

public ActionResult Index(HttpPostedFileBase file)

{

if (file.ContentLength > 0)

{

var fileName = Path.GetFileName(file.FileName);

var path = Path.Combine(Server.MapPath("~/Assets/Upload/Users/Profiles"), fileName);

file.SaveAs(path);

}

return RedirectToAction("Index");

}

when i use this line with else statement it is not work

else

{

Directory.CreateDirectory(Server.MapPath("~/Assets/Upload/Users/Profiles"));

}

iwant to know how i can set my code please help me