Cookies are the small pieces of information that are stored in client system or browser memory and helped as client site state management for an web based application. Generally we can have two types of cookies
Non Persistent Cookies
Persistent Cookies : also known as
permanent cookies, which is
stored in client
hard-drive until it expires . persistent cookies should have set with
expiration dates. Sometimes its stays until the user deletes the cookie. Persistent cookies are used to collect identifying information about the user from that system.
Non Persistent Cookies : This can be called as
Temporary Cookies. If there is no expires time defined then the cookie is stored in
browser memory .
Therefore there is no difference between modifying persistent or non-persistent cookies. Only difference between them are
Persistent cookies should have an Expatriation time defined within it.
Let’s have a quick look how to make cookies as persistent
//Creting a Cookie Object HttpCookie _userInfoCookies = new HttpCookie("UserInfo"); //Setting values inside it _userInfoCookies["UserName"] = "Abhijit"; _userInfoCookies["UserColor"] = "Red"; _userInfoCookies["Expire"] = "5 Days"; //Adding Expire Time of cookies _userInfoCookies.Expires = DateTime.Now.AddDays(5); //Adding cookies to current web response Response.Cookies.Add(_userInfoCookies);
Now once you have set with the Cookies expires time , it will be stored in hard drive until expires or user manually delete or clear all the cookies. If you want your cookies need to be expires before the expiration time that you have mentioned earlier, you just need to override the cookies information.
HttpCookie _userInfoCookies = new HttpCookie("UserInfo"); //Adding Expire Time of cookies before existing cookies time _userInfoCookies.Expires = DateTime.Now.AddDays(-1); //Adding cookies to current web response Response.Cookies.Add(_userInfoCookies);
This will override the existing cookies information.
For more information on ASP.NET Cookies, please read http://www.codeproject.com/KB/aspnet/Beginners_Cookies.aspx