ASP. NET cookie knowledge

// Write
Protected void button2_click (Object sender, eventargs E)
{
Httpcookie cookie = new httpcookie ("mycook"); // initialize and set the cookie name
Datetime dt = datetime. now;
Timespan Ts = new timespan (0, 0, 1, 0, 0); // The expiration time is 1 minute.
Cookie. expires = DT. Add (TS); // set the expiration time
Cookie. Values. Add ("userid", "userid_value ");
Cookie. Values. Add ("userid2", "userid2_value2 ");
Response. appendcookie (cookie );
// Output all content of the cookie
// Response. Write (cookie. Value); // The output is: userid = userid_value & userid2 = userid2_value2
}

// Read
Protected void button#click (Object sender, eventargs E)
{

// Httpcookie Cokie = new httpcookie ("mycook"); // initialize
If (request. Cookies ["mycook"]! = NULL)
{
// Response. Write ("the key value in the cookie is userid:" + request. Cookies ["mycook"] ["userid"]); // The whole line
// Response. Write ("the key value in the cookie is userid2" + request. Cookies ["mycook"] ["userid2"]);
Response. Write (request. Cookies ["mycook"]. Value); // output all values
}
}

// Modify the cookie
Protected void button3_click (Object sender, eventargs E)
{
// Obtain the cookie object of the Client
Httpcookie COK = request. Cookies ["mycook"];

If (COK! = NULL)
{
// Two methods for Cookie Modification
COK. Values ["userid"] = "alter-value ";
COK. Values. Set ("userid", "alter-value ");

// Add new content to the cookie
COK. Values. Set ("newid", "newvalue ");
Response. appendcookie (COK );
}

}
// Delete the cookie
Protected void button4_click (Object sender, eventargs E)
{

Httpcookie COK = request. Cookies ["mycook"];
If (COK! = NULL)
{
If (! Checkbox1.checked)
{
COK. Values. Remove ("userid"); // remove the value whose key value is userid
}
Else
{
Timespan Ts = new timespan (-1, 0, 0, 0 );
COK. expires = datetime. Now. Add (TS); // Delete the entire cookie, as long as the expiration time is set to the current
}
Response. appendcookie (COK );
}
}