C # use cookie

Code

// Write
Protected   Void Button#click ( Object Sender, eventargs E)
{
Httpcookie = 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 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 ); // Output: userid = userid_value & userid2 = userid2_value2
}

//Read
Protected VoidButton2_click (ObjectSender, eventargs E)
{

// Httpcookie Cokie = new httpcookie ("mycook "); // Initial tutorial
If (Request. Cookies [ " Mycook " ] ! = Null )
{
// Response. Write ("the key value in the cookie is userid:" + request. Cookies ["mycook"] ["userid"]); // 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 cookie
Protected   Void Button3_click ( Object Sender, eventargs E)
{
// Obtain the cookie object of the client.
Httpcookie COK = Request. Cookies [ " Mycook " ];

If (COK ! =   Null )
{
// Cookie modification methods
COK. Values [ " Userid " ] =   " Alter-Value " ;
COK. Values. Set ( " Userid " , " Alter-Value " );

// Add new content to cookies
COK. values. set ( " newid " , " newvalue " );
response. appendcookie (COK);
}< BR >}

//Delete cookie
Protected VoidButton4_click (ObjectSender, eventargs E)
{

Httpcookie COK = Request. Cookies [ " Mycook " ];
If (COK ! =   Null )
{
If ( ! Checkbox1.checked)
{
COK. Values. Remove ( " Userid " ); // Remove the userid key value.
}
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 );
}
}