create Cookie

        //Creting a Cookie Object
        HttpCookie _userInfoCookies = new HttpCookie("UserInfo");

        //Setting values inside it
        _userInfoCookies["UserName"] = "Abhijit";
        _userInfoCookies["UserColor"] = "Red";
        _userInfoCookies["Expire"] = "5 Days";

        //Adding Expire Time of cookies
        _userInfoCookies.Expires = DateTime.Now.AddDays(5);

        //Adding cookies to current web response
        Response.Cookies.Add(_userInfoCookies);

转载于:https://www.cnblogs.com/greencolor/archive/2010/02/17/1668940.html