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Cookies in ASP.Net

Posted Date: 16 May 2008	Resource Type: Articles	Category: Web Applications
Author: shakti singh tanwar	Member Level: Diamond
Rating:	Points: 10

Introduction

Cookies are small piece of information avilable on client that is used to keep vital information from server.Cookies are of two types:-
1.) Session Cookie:- The cookie lifetime is controlled by user’s session.When session expires cookie expires too.
2.) Persistent Cookie:-Like in dotnet spider if you select “Remember Me on this computer” checkbox while logging into the site then you don’t need to login again when you come back to the site after closing the browser without signing out.This is because the lifetime of persistent cookie is set by the user and not depedent on session lifetime.

Cookie are created using HTTPCOOKIE class and then added to the Response object’s Cookie cllection.Once you add a cookie to Response it will be available in Cookie’s collection of Request object on every subsequent request from the client.

Cookies are used vastly by sites for session management purposes and stores session id provided by the server after a successful login.Once logged in this session id is carried by Request back n forth to the server with every client request and thus helps the server identify an authenticated user.

Example

StringBuilder sb = new StringBuilder();
// Get cookie from the current request.
HttpCookie cookie = Request.Cookies.Get("DateCookie");

// Check if cookie exists in the current request.
if (cookie == null)
{
sb.Append("Cookie was not received from the client. ");
sb.Append("Creating cookie to add to the response.
");
// Create cookie.
cookie = new HttpCookie("DateCookie");
// Set value of cookie to current date time.
cookie.Value = DateTime.Now.ToString();
// Set cookie to expire in 10 minutes.
cookie.Expires = DateTime.Now.AddMinutes(10d);
// Insert the cookie in the current HttpResponse.
Response.Cookies.Add(cookie);
}
else
{
sb.Append("Cookie retrieved from client.
");
sb.Append("Cookie Name: " + cookie.Name + "
");
sb.Append("Cookie Value: " + cookie.Value + "
");
sb.Append("Cookie Expiration Date: " +
cookie.Expires.ToString() + "
");
}
string cookieText = sb.ToString();

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