保存cookies：  　　　　public bool SaveCookie(string str1,string str2,string str3)        {            HttpCookie cookies = new HttpCookie("CookieName");            cookies.Values.Add("nickname", str1);            cookies.Values.Add("password", str2);            cookies.Values.Add("username", str3);            cookies.Path = "/";            cookies.Expires = DateTime.MaxValue;            //将该cookie设置应用范围            cookies.Domain = "www.baidu.com";//将cookie增加到response中            HttpContext.Current.Response.Cookies.Add(cookies);            return true;        }

删除cookise：

　　　　public bool DelCookie()        {            // 退出登录状态            HttpCookie cookies = HttpContext.Current.Request.Cookies["CookiesName"];            if (cookies != null)            {                //过期时间设置为立即过期                cookies.Expires = DateTime.Now.AddDays(-1); 　　　　　　　　　　//从request的cookies中移除                if (HttpContext.Current.Request.Cookies["str1"] != null)                {
                        HttpContext.Current.Request.Cookies.Remove("str1");                }                if (HttpContext.Current.Request.Cookies["str2"] != null)                {
                        HttpContext.Current.Request.Cookies.Remove("str2");                }                if (HttpContext.Current.Request.Cookies["str3"] != null)                {
                        HttpContext.Current.Request.Cookies.Remove("str3");                }                 HttpContext.Current.Request.Cookies.Remove("CookiesName");                //设置cookie的作用于全域                cookies.Domain = "www.baidu.com";            }            cookies = HttpContext.Current.Response.Cookies["CookiesName"];            if (cookies != null)            {                //设置response的cookies过期时间为立即过期                cookies.Expires = DateTime.Now.AddDays(-1);                //从Response的cookies中移除                HttpContext.Current.Response.Cookies.Remove("str1");                HttpContext.Current.Response.Cookies.Remove("str2");                HttpContext.Current.Response.Cookies.Remove("str3");                HttpContext.Current.Request.Cookies.Remove("CookiesName");                //设置cookie的作用于全域                cookies.Domain = "www.baidu.com";            }            return true;        }

在删除cookies时，有时只用request方式删除就行，有时只用response方式删除就行，最后两者都写上。