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Client Side State Management Using Cookies

Posted Date: 14 Apr 2008 Resource Type: Articles Category: Web Applications

Posted By: Abhijit Jana Member Level: Gold
Rating:

Points: 8

Introduction

What is Cookie ?
A Cookie is small amount of data that is created by web server and store in Client System Either in flat file or memory.
There are two types of cookies
Temporary [ stored in memory]
Persistence [ stored in flat File ]

Use of Cookies:

To identify the user who is viewing the page
To use Remember password facility
store user preference
store encrypted token data

Part of web client and web server to create and use cookies:

Step 1: If user visit first time in the side , user send the request to web page
Step 2 : Web server create corresponding required cookies and send with the response that may be store in client system or memory
Step 3 : After step 2 , for every step client will send the cookies information to the same Web server for viewing any page

Reading and writing cookies

For writing cookies we have to use Response.Cookies and Reading Request.Cookies
E.g
For write


Response.Cookies["lastVisitTime"].Value = DateTime.Now.ToString();
Response.Cookies["lastVisitTime"].Expires = DateTime.Now.AddDays(1);

For Read


if(Request.Cookies["lastVisitTime"] != null)
       Response.Write ("Last Visted At : "  + Server.HtmlEncode(Request.Cookies["lastVisitTime"].Value);

Limitation of Cookies

Maximum Cookies: We can store maximum 20 Cookies / Sites
Size of Cookies : Maximum size / vookies is 4 KB
To avoid this disadvantage we can use multiple cookies in a single cookies


Response.Cookies["UserDetails"]["firstName"].Value = "Abhijit";
Response.Cookies["UserDetails"]["lastName"].Value = "Jana";

We can also have Domain and Path property to limit the scope of cookies

Summary

Cookies is the best way to store temporary data in client side

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