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这里主要采用cookies共享。
步骤1：[写cookies]
            //创建一个HttpCookie对象
            HttpCookie cookie = new HttpCookie("uId");
            //设定此cookies值
            cookie.Value = "uIdValue";
            cookie.Domain= "company.com";
            //设定cookie的生命周期，在这里定义为一个小时
            DateTime dtNow = DateTime.Now;
            TimeSpan tsMinute = new TimeSpan(0, 1, 0, 0);
            cookie.Expires = dtNow + tsMinute;
            //加入此cookie
            Response.Cookies.Add(cookie);
            Response.Write(Request.Cookies["uId"].Value.ToString() + "Cookie创建完毕 <br > <hr > ");
步骤2：[读cookies]
           HttpCookie cookie = Request.Cookies["uId"];
            if (cookie != null)
            {
                   Response.Write(Request.Cookies["uId"].Value.ToString();
            }

步骤3：[删除cookies]  注销用

          HttpCookie MyCo = HttpContext.Current.Request.Cookies["uId"];
            if (HttpContext.Current.Request.ServerVariables["Http_Host"].IndexOf("company.com") >= 0)
            {
                MyCo.Domain = "company.com";
            }
            MyCo.Expires = DateTime.Now.AddHours(-24);
            Response.Cookies.Add(MyCo);//这一句非常重要