//添加Cookie            //第一种添加Cookie方法            HttpCookie myCookie = new HttpCookie("userrole");            myCookie.Values["a"] = "a";            myCookie.Values["b"] = "b";            myCookie.Expires.AddDays(1);            Response.AppendCookie(myCookie);                      //第二种添加Cookie方法            HttpCookie myCookie = new HttpCookie("userrole");            myCookie.Values["a"] = "a";            myCookie.Values["b"] = "b";            myCookie.Expires.AddDays(1);            Response.Cookies.Add(myCookie);            //第三种添加Cookie方法            HttpCookie myCookie = new HttpCookie("userrole");            myCookie.Value = "a";            Response.Cookies.Add(myCookie);            //第四种添加Cookie方法            HttpContext.Current.Response.Cookies.Add(new HttpCookie("userrole", "超级管理员"));            Response.Cookies["userrole"].Value = "超级管理员";            HttpCookie cookie = Request.Cookies["userrole"];            Response.Write(cookie.Value);            //第五种添加Cookie方法            string strName = "a";            string strValue = "b";            int  expires = 2;            HttpCookie cookie = HttpContext.Current.Request.Cookies[strName];            if (cookie == null)            {                cookie = new HttpCookie(strName);            }            cookie.Value = strValue;            cookie.Expires = DateTime.Now.AddMinutes(expires);//可以不写            HttpContext.Current.Response.AppendCookie(cookie);            //第六种添加Cookie方法            string strName = "a";            string strValue = "b";            string key = "c";                      HttpCookie cookie = HttpContext.Current.Request.Cookies[strName];            if (cookie == null)            {                cookie = new HttpCookie(strName);            }            cookie[key] = strValue;            cookie.Expires = DateTime.Now.AddMinutes(expires);            HttpContext.Current.Response.AppendCookie(cookie);                                 //获取cookie            //第一种获取Cookie方法            Response.Write(Request.Cookies["userrole"].Values["a"].ToString());            //第二种读取Cookie方法            HttpCookie cookie = Request.Cookies["userrole"];            Response.Write(cookie.Values["a"].ToString());            Response.Write(cookie.Values["b"].ToString());                                //第三种读取Cookie方法            Response.Write(Request.Cookies["userrole"].Value);                     //第四种读取Cookie方法            Response.Write(Request.Cookies["userrole"].Value);            //第五种读取Cookie方法           if( HttpContext.Current.Request.Cookies != null && HttpContext.Current.Request.Cookies[strName] != null)                HttpContext.Current.Request.Cookies[strName].Value.ToString();           //第六种读取Cookie方法           if (HttpContext.Current.Request.Cookies != null && HttpContext.Current.Request.Cookies[strName] != null && HttpContext.Current.Request.Cookies[strName][key] != null)               HttpContext.Current.Request.Cookies[strName][key].ToString();