增加：
第一种方法：Response.Cookies[“UserName”].Value=”张三”
Response.Cookies[“UserName”].Expires=DateTime.Now.AddDays(1);
第二种方法：
HttpCookie cookie=new HttpCookie(“UserName”);
cookie.Value=”张三”;
cookie.Expires=DateTime.Now.AddDays(1);
Response.Cookies.Add(cookie);
多值Cookie（子键）：
第一种方法：
Response.Cookies[“UserInfo”][“userName”]=”张三”;
Response.Cookies[“UserInfo”][“pwd”]=”123”;
Response.Cookies[“UserInfo”].Expires=DateTime.Now.AddDays(1);
第二种方法：
HttpCookie cookie=new HttpCOokie(“UserInfo”);
cookie.Values(“userName”)=”张三”;
cookie.Values(“pwd”)=”123”;
cookie.Expires=DateTime.Now.AddDays(1);
Response.Cookies.Add(cookie);
删除：
删除单个Cookie
Response.Cookies[“userName”].Expires=DateTime.Now.AddDays(-1);
删除所有的Cookie
HttpCookie aCookie;
String cookieName;
int count=Request.Cookies.Count;
for(int i=0;i<count;i++)
{
cookieName=Request.Cookies[i].Name;
aCookie=new HttpCookie(cookieName);
aCookie.Expires=DateTime.Now.AddDays(-1);
Response.Cookies.Add(aCookie);
}
删除单个子键
HttpCookie aCookie=Request.Cookies[“userInfo”];
aCookie.Values.Remove(“userName”);
aCookie.Expires=DateTime.Now.AddDays(-1);
Response.Cookies.Add(aCookie);
修改：
修改单个Cookie
Response.Cookies[“userName”].Value=”李四”;
Response.Cookies[“userName”].Expires=DateTime.Now.AddDays(1);
修改单个子键
Response.Cookies[“UserInfo”][“pwd”]=”234”;
Response.Cookies[“UserInfo”].Expires=DateTime.Now.AddDays(1);
读取：
If(Request.Cookies[“userName”]!=null)
{
Lable1.Text=Request.Cookies[“userName”].Value;
}
或者
If(Request.Cookies[“userName”]!=null)
{
HttpCookie cookie=Request.Cookies[“userName”];
Lable.Text=cookie.Value;
}
多值读取：
If(Request.Cookies[“UserInfo”]!=null)
{
Lable1.Text=Request.Cookies[“UserInfo”][“userName”];
Lable2.Text=Request.Cookies[“UserInfo”][“pwd”];
}
读取所有的Cookie
for(int i=0;i<Request.Cookies.Count;i++)
{
aCookie=Request.Cookies[i];
string name=aCookie.Name;
string value=aCookie.Value;
}