Hi,
A cookie is used to store small piece of information on client machine.A cookie contains page-specific information that a web server sends to a client along with page output.Cookies are used for sending page specific information because HTTP is a stateless protocol and cannot indicate whether page request coming from the same or different client.You can use cookies to keep track of individual user who access a web page across HTTP connection.
Cookies are saved on the client computer.Cookies can be either temporary or persistent.Temporary cookies also know as session cookies,exist in the memory space of browser.When the browser is closed,all the session cookies added to the browser are lost.A persistent cookie is saved as a text file in the file system of the client computer.
Cookies enable you to store information about a client,session,or application.When a browser request a page,it sends the information in the cookie along with the request information.A web server reads the cookie and extracts its value.
Advantages of Cookies:
1.A cookie is stored on the client computer and can be read by the server after a request for a page is posted.Therefore,no server resource is involved in maintaining the cookie.
2.A cookie is a text based data structure that contains key-value pairs.Therefore ,it is easy to create and manipulate cookie.
3.A cookie can either expire when the browser ends or exist indefinitely on the client computer,subject to the expiration rules on the client.
Limitation of Cookies:
1.Cookies that are stored on client computers have a limited size.Most browsers allow cookie to have up to 4096 bytes in size.Therefore you cannot store a large amount of data in a cookie.
2.Users can temper with cookies because cookies are stored on client computer.
3.Users can disable cookies to prevent from being stored on the hard disk of their computer.If a user denies permission for cookies,an ASP.net web application cannot store cookies on client computer.
Regards
S.S.Bajoria
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