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);