string strCookie="";
//创建一个名为user
HttpCookie userCookie=new HttpCookie("user");
//value给单个Cookie值赋值
userCookie.Value="nihao";
Response.Cookie.Add(userCookie);

//取值
HttpCookie userCookie=Request.Cookie["user"];
strCookie=userCookie.Value;

//在一个Cookie中储存多个信息，那也没有问题
//values是获取单个cookie对象键值对的集合
HttpCookie userCookie=new HttpCookie("user");
userCookie.values.Add("nihao",txtName.value);
userCookie.values.Add("nihao2",txtName2.value);
Response.Cookie.Add(userCookie);

//取值
HttpCookie userCookie=Request.Cookie["user"];
cookie1=userCookie.Values["nihao"];
cookie2=userCookie.Values["nihao"];