For use on blog post http://normansolutions.co.uk/post/secure-a-webpage-without-a-logon

SecureHead.cshtml

@using System.Configuration;

@{

    string ComplexURLFromWebConfig = ConfigurationManager.AppSettings["ComplexURLQueryString"].ToString().Trim();
    
    @* QueryString sent from url *@
    string QueryStringComplexURL = (Request.QueryString["ComplexURLQueryString"] ?? "").ToString().Trim();


    if (ComplexURLFromWebConfig != QueryStringComplexURL || Request.Cookies["NSSecureMethodCookie"] == null)
    {
        var data = "Unathorised";
        Response.Write(data);
        Response.End();
    }    

}