GetSiteRoot

public static string GetSiteRoot()
{
    var port = HttpContext.Current.Request.Url.Authority;
    var protocol = HttpContext.Current.Request.Url.Scheme;
    var sOut = protocol + "://" + port + "/" + HttpContext.Current.Request.ApplicationPath;

    if (sOut.EndsWith("/"))
        sOut = sOut.Substring(0, sOut.Length - 1);

    var sOut = protocol + HttpContext.Current.Request.ServerVariables["SERVER_NAME"] + port +
                HttpContext.Current.Request.ApplicationPath;

    if (sOut.EndsWith("/"))
    {
        sOut = sOut.Substring(0, sOut.Length - 1);
    }

    return sOut;
}