![]() ![]() This class holds data of any type as part of a key/value pair and provide protection from potential concurrent access (since multiple clients can access the same application state) through the HttpApplicationStateLock class. The application state is accessed through the Application property of the HttpApplication class, which returns an instance of class HttpApplicationState. It's important to mention that its data are replicated with each application instance and the application state maintains its data until the web application is shut down or we release the data manually by assigning null or call the Clear() method. The application state is a repository for global data in a web application. memory) to store the state information on the server machine.Īn example of server-side state management techniques are: ![]() This kind of management use the server resources (i.e. protected void Page_Load(Object sender, EventArgs E)ĪrrayList cart = (ArrayList)ViewState The view state for control is loaded just before the Load event firing, and it is flushed just before the Render method being invoked. View state supports storing any type that is serializable and since the Page class is derived from the Control base class, it is accessible directly from within your pages and indirectly through server-side controls. View state is a mechanism introduced by ASP.NET which stores data in a hidden field called _VIEWSTATE on each ASP.NET page and each time a page is posted to itself, the content is sent as part of the post. ![]() HttpCookie cookie = new HttpCookie("Test") ĬookieValue = Convert.ToInt32() protected void Page_Load(Object sender, EventArgs E) To request that a client set a cookie, add a new HttpCookie instance to the response cookie collection before your page rendering. Both request and response objects expose the collection of cookies through the HttpCookieCollection and each cookie is a name/value pair that are accessible through the Values collection of the HttpCookie class or indirectly through the default indexer provided by the class. In order to manage cookie data more easily, ASP.NET provides the HttpCookie class. The amount of data sent through cookies differ from browser to browser but 4,096 bytes are guaranteed. SameSite: let servers require that a cookie shouldn't be sent with cross-site requests.Path: indicates a URL path that must exist in the requested URL in order to send the Cookie header.If unspecified, it defaults to the host of the current document location (subdomains excluded). Domain: specifies the allowed hosts to receive the cookie.HttpOnly: makes the cookie inaccessible to JavaScript's okie API.Secure: the cookie will be sent to the server only with an encrypted request over the HTTPS protocol.Max-Age: makes the cookie expire after a specific length of time.Expires: makes the cookie expire at a specific date.Set-Cookie: second_cookie=world Expires=Wed, 07:28:00 GMT Įach cookie can have one o more of the following attributes: When a web application sets a cookie, it can provide an expiration date, a duration, apply restrictions to a specific domain and path to limiting where the cookie is sent and so on. All cookies are stored in a single file and will be included in the HTTP header on each request made to the same server. The server resources aren't utilized and it uses the client information received each call to rebuild the state of the prior invocation.Īn example of client-side state management techniques are:Ī cookie is a data received from a web application which is stored by the browser. The information of the calls between the browser and the server are stored in the HTML page, in an HTTP request, or on the disk of the client computer. However, many web applications may need to memorize the state to function properly (i.e. The cause of that is the reduction of scalability caused by the fact that the pages shown to a specific user will be different from those shown to another user and cannot be reused or cached. Whenever you visit a web application, your browser will communicate with the respective server through HTTP or HTTPs protocol, but because its stateless nature, if you visit the same web application again after closing the web browser, there will be no trace of your previous visit.Īttempting to manage state in web applications goes against the fundamental design principles to provide a scalable medium for sharing information on the web. ![]()
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