Get URL to website from within Application_Start?

Hi,

I need to generate a correct URL to a action in my APS.NET MVC 3 website and this have to be done in the Application_Start in Gloabl.asax.

I have tried to set a UrlHelper but the HttpContext.Current is always null?

The adress i look for is somthing like this : http://www.mysite.se/MyController/MyAction.

I have also tried VirtualPathUtility.ToAbsolute("~/") but that will only give me "/mysite/"