Asp.net删除Cookie

以下是我刚刚完善的删除cookie的方法

        /// <summary>
        /// 删除Cookies
        /// </summary>
        /// <param name="CoName">Cookie的名称</param>
        /// <param name="domain">Cookie的domain</param>
        /// <returns>布尔类型</returns>
        public static void DeleteCookie(string CoName, string domain)
        {
            if (HttpContext.Current.Request.Browser.Cookies)
            {
                if (HttpContext.Current.Request.Cookies[CoName] != null)
                {
                    HttpCookie cookie = new HttpCookie(CoName);
                    cookie.Expires = DateTime.Now.AddYears(-5);
                    if (!string.IsNullOrEmpty(domain))
                    {
                        cookie.Domain = domain;
                    }
                    HttpContext.Current.Response.Cookies.Add(cookie);
                }
            }
            //else
            //{
            //    HttpContext.Current.Session[CoName] = "";
            //}
        }

当前域名为a.mydomain.com，mydomain.com域名下有个cookie名称为total的cookie，a.mydomain.com域名下有cookie名称为count的cookie。

不指定域名的情况下，只能删除当前域名下的cookie 

DeleteCookie("total",""); 删除不掉total

DeleteCookie("count",""); 可以删除掉count

指定域名的话，也只能删除指定域名下的cookie

DeleteCookie("total","mydomain.com“); 可以删除掉total

DeleteCookie("count","mydomain.com“);  删除不掉count

两者结合的正确的用法

DeleteCookie("total","mydomain.com“); 

DeleteCookie("count","");