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Collection of keys for all the items in the collection. The following techniques can be used for HTTP session management: Most often cookie is used to store a session ID.

RFC 1945: "Hypertext Transfer Protocol HTTP/1.0", 1996. This information i.e., the current value of all the controls and variables for the current user in the current session is called the State. Cookie is sent and stored in clear text and not encrypted.

Removes all keys and values from the session-state collection. Removes the specified item from the session state collection. Cookie could pose some privacy concern: A cookie cannot snoop the hard disk and find out who you are or what your income is. The entire applicationby setting the EnableViewState pro… Locks the application state collection so only the current user can access it. This object is represented by class file global.asax. Let us keep a counter, which is incremented each time the page is posted back by clicking a button on the page. A label control shows the value in the counter. The principle is to include an HTML form with a hidden field containing a session ID in all the HTML pages sent to the client.  This hidden field will be returned back to the server in the request.  No cookie needed. It does not require the server to retain session information or a status about each communicating partner for multiple request. A page by setting the EnableViewState attribute of the Page directive, as <%@ Page Language="C#" EnableViewState="false" %>. Sets the state of the StateBag object as well as the Dirty property of each of the StateItem objects contained by it. When session state is turned on, a new session state object is created for each new request. The view state could be enabled or disabled for: The entire application by setting the EnableViewState property in the section of web.config file. For example, the following Java servlet uses cookie for managing session ID: The problem on using cookie is some users disable cookie due to the real and perceived privacy concerns over cookies. Cookies. The following example demonstrates the concept of storing session state. The number of items in the session state collection. When a page is sent back to the client, the changes in the properties of the page and its controls are determined, and stored in the value of a hidden input field named _VIEWSTATE. It cannot access your hard disk, read/write your files or format your hard disk. You could use the following code for the same: The above code stores only strings in the Session dictionary object, however, it can store all the primitive data types and arrays composed of primitive data types, as well as the DataSet, DataTable, HashTable, and Image objects, as well as any user-defined class that inherits from the ISerializable object.

The state bag is a data structure containing attribute value pairs, stored as strings associated with objects. Session state is generally used for storing application data such as inventory, supplier list, customer record, or shopping cart. It is implemented using a view state object defined by the StateBag class which defines a collection of view state items. Removes the specified item from the application state collection. When information is stored in application state, it is available to all the users. When the client disconnects from the server, the ASP.NET engine discards the page objects. It should look like the following in design view: Execute the file and observe how it works: The ASP.NET application is the collection of all web pages, code and other files within a single virtual directory on a web server. It is automatically maintained across posts by the ASP.NET framework. Cookie is not a program: A cookie is just a simple piece of text. The HttpSessionState class has the following properties: The HttpSessionState class has the following methods: The session state object is a name-value pair to store and retrieve some information from the session state object. Adds an item to the view state collection and existing item is updated. RFC 2109: "HTTP State Management Mechanism", 1997, (obsolete by RFC2965). Sets the Dirty property for the specified StateItem object in the StateBag object. HTTP is called as a stateless protocol because each command is request is executed independently, without any knowledge of the requests that were executed before it. The only way such information could end up in a cookie is if you provide them (e.g., filling up a form) to a site that creates the cookie. shopping cart), or tracking popular links, or for demographics purpose. Sessions are identified and tracked with a 120-bit SessionID, which is passed from client to server and back as cookie or a modified URL. The session state object is created from the HttpSessionState class, which defines a collection of session state items. The main limitation of using cookie for tracking is users may disable cookie in their browser. The protocol is designed to be stateless for simplicity. ).  Again, careful and tedious programming efforts are required.  The advantage is all browser supports URL rewriting. The session management is done at the server side, instead of client side. A cookie is created when a client visits a site for the first time. A server-side program sends a response message containing a "Set-Cookie" response header. The header contains a name/value pair of the cookie plus some additional information. HTTP is a stateless (or non-persistent) protocol. Basically, HTTP is a TCP/IP based communication protocol, that is used to deliver data (HTML files, image files, query results, etc.) The SessionID is globally unique and random. RFC2965: "HTTP State Management Mechanism", 2000. HTTP is a stateless protocol. That is, the server does not hold any information on previous requests sent by the client. Client-side cookies were introduced by Netscape to maintain state, by storing client-specific information on the client's machine and later retrieved to obtain the state information. Montulli, the creator of cookie from Netscape, chose the term "cookie" as "a cookie is a well-known computer science term that is used when describing an opaque piece of data held by an intermediary".  The term opaque here implies that the content is of interest and relevance only to the server and not the client. on the World Wide Web. Relevant session data is sent to the receiver by the client in such a way that every packet of information transferred can be understood in isolation, without context information from previous packets in the session. It is the protocol used for the web. When a user connects to an ASP.NET website, a new session object is created.

RFC 2616: "Hypertext Transfer Protocol HTTP/1.1", 1999. There are two buttons on the page, a text box to enter string and a label to display the text stored from last session. This property of stateless protocols makes them ideal in high volume applications, increasing performance by removing server load caused by retention of ses… Removes all the items from the application state collection. Hence, cookie cannot fill up your hard disk. RFC 2964: "Use of HTTP State Management", 2000. This is susceptible to eavesdropping and malicious tampering during transit. "Persistent Client State: HTTP Cookie (Cookie Version 0 Specification)", Netscape. RFC2965 define a new header "Set-Cookie2", which might not be widely supported by browsers, as follows: The client returns the cookie(s) to the matching domain and path in the subsequent requests, using a "Cookie" request header. To accomplish this objective, you must rewrite all the URLs in all the HTML files that is send to the client with this unique session ID (such as ,