Create authentication cookie

public static HttpCookie BuildCookie(int userprofileId)
{
    FormsAuthentication.Initialize();

    FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
        1,
        userprofileId.ToString(CultureInfo.InvariantCulture),
        DateTime.Now,
        DateTime.Now.AddMinutes(30),
        false,
        UserprofileRole.GetStringByUserprofile(userprofileId),
        FormsAuthentication.FormsCookiePath);

    string hashedTicket = FormsAuthentication.Encrypt(ticket);
    HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, hashedTicket);
    return cookie;
}