让WebService在远程调用时支持Cookie

服务器端无需设置，客户端设置如下：

yixin.Service ws_user = new yixin.Service();
System.Net.CookieContainer Cookies = new System.Net.CookieContainer();
AddCookie(ref ws_user);
wsStr = ws_user.HelloWorld();

public void AddCookie(ref dmj_pic.ws_user.Service service)
        {
            System.Net.CookieContainer cookies = new System.Net.CookieContainer();
            string cookieDomain = new Uri(service.Url).Host;
            foreach (string cookieKey in HttpContext.Request.Cookies.AllKeys)
            {
                System.Net.Cookie netCookie = new System.Net.Cookie(cookieKey,HttpContext.Request.Cookies[cookieKey].Value,"/",cookieDomain);
                netCookie.Expires = DateTime.Now.AddMinutes(5);
                cookies.Add(netCookie);
            }

            service.CookieContainer = cookies;
        }