ASP.NET

Session state has created a session id, but cannot save it because the response was already flushed by the application.

cookie = Request.Cookies["Userword"];

if (cookie != null)
{
    string strCookie = cookie.Value;

    if (strCookie != "")
    {
        sin.AutoLogin(cookie.Values["heavy"],
            cookie.Values["metal"],
            true, Request.UrlReferrer.AbsoluteUri == null ? "" : Request.UrlReferrer.AbsoluteUri, false);

    }
}
else
{
    if (Session["UserInfo"] == null)
    {
        Response.Redirect("login.aspx");
    }
}