ASP.NET读写cookies

/// <summary>
    /// 写Cookies
    /// </summary>
    /// <param name="response"></param>
    /// <param name="request"></param>
    /// <param name="server"></param>
    /// <param name="IndexValue"></param>
    /// <param name="TextValue"></param>
    /// <param name="ExpriesHour">设置的过期时间</param>
    public void WriteCookies(HttpResponse response,HttpRequest request,HttpServerUtility server,string IndexValue,string TextValue,int ExpriesHour)
    {
        response.Cookies[IndexValue].Value = TextValue;
        response.Cookies[IndexValue].Expires = System.DateTime.Now.AddHours(ExpriesHour);
    }
    /**//// <summary>
    /// 读Cookies
    /// </summary>
    /// <param name="response"></param>
    /// <param name="request"></param>
    /// <param name="server"></param>
    /// <param name="IndexValue"></param>
    /// <returns></returns>
    public string ReadCookies(HttpResponse response, HttpRequest request, HttpServerUtility server, string IndexValue)
    {
        if (request.Cookies[IndexValue] != null)
            return request.Cookies[IndexValue].Value.ToString();
        return "";
    }
    /**//// <summary>
    /// 删除Cookies，立即过期
    /// </summary>
    /// <param name="response"></param>
    /// <param name="request"></param>
    /// <param name="server"></param>
    /// <param name="IndexValue"></param>
    public void DeleteCookies(HttpResponse response, HttpRequest request, HttpServerUtility server, string IndexValue)
   {
        if (request.Cookies[IndexValue] != null)
        {            
            HttpCookie cookies=request .Cookies[IndexValue];
            cookies .Expires=System.DateTime.Now.AddHours(-1);
            response.Cookies.Add(cookies);
        }
    }