asp.net of cookies in C #

Write cookies
HttpCookie cookie = new HttpCookie ("info");//define Cookie object and item named info
DateTime dt = datetime.now;//Definition Time Object
TimeSpan ts=new TimeSpan (1,0,0,0)//cookie effective time, specifically check MSDN
Cookie. EXPires = dt. Add (ts);//Adding Action time
Cookie. Values.add ("User", "CXBKKK")//Add Property
Cookie. Values.add ("userid", "1203");
Response.appendcookie (cookie);//determine read cookie in write cookie
if (request.cookies["Info"]!=null)
{
String temp=convert.tostring (request.cookies["Info"). values["user") + "" +convert.tostring (request.cookies["Info"). values["userid"]);
Read it all with request.cookies["Info". Value)
if (temp== "")
{
Response.Write ("Empty");
}
Else
Response.Write (temp);
}
Else
{
Response.Write ("error");
Modify Cookies
response.cookies["Info" ["user"] = "2";
response.cookies["Info"]. Expires = DateTime.Now.AddDays (1);

Delete a property under a cookie
HttpCookie acookie=request.cookies["Info"];
Acookie. Values.remove ("userid");
Acookie. Expires = DateTime.Now.AddDays (1);
RESPONSE.COOKIES.ADD (Acookie); Delete all cookies, that is, set the expiration time for now.
int limit=request.cookies.count-1;
for (int i=0;i<limit;i++)
{
Acookie = Request.Cookies (i)
Acookie. Expires = DateTime.Now.AddDays (-1)
RESPONSE.COOKIES.ADD (Acookie)
}

Read All Cookies
HttpCookieCollection cookies;
HttpCookie Onecookie;
cookies = Request.Cookies;

string[] Cookiearray = cookies. AllKeys;
for (int i=0 i < cookiearray.length; i++)
{
Onecookie = Cookies[cookiearray[i]];
Response.Write (Onecookie.name + "-" + onecookie.value);
}

//Add single Cookies
if (Request.Browser.Cookies = = True)
{
 if (request.cookies["LastVisited1"] = = null)
 {
  httpcookie newcookie = new HttpCookie ("LastVisited1", DateTime.Now.ToString ());
  newcookie.expires = DateTime.Now.AddYears (1);
  response.cookies.add (Newcookie);
 }
 else
 {
  response.write (request.cookies["LastVisited1"). Value);
 } 
}