Ibrahym Voelckel Pundit. What is difference between session and application state? Application state is stored in memory on the server and is faster than storing and retrieving information in a database.
Unlike session state , which is specific to a single user session , application state applies to all users and sessions. Application state is stored in an instance of the HttpApplicationState class. Alban Haumschild Pundit. What is the difference between session object and application object? The Application object is used to store and access variables from any page, just like the Session object.
Jacqueline De Santis Teacher. What is application in JSP? The instance of ServletContext is created only once by the web container when application or project is deployed on the server.
This object can be used to get initialization parameter from configuaration file web. Edileuza Obermair Teacher. What is a request object? ASP Request Object. The Request object retrieves the values that the client browser passed to the server during an HTTP request. It is used to get information from the user. Using this object , you can dynamically create web pages and perform various server-side actions based on input from the user.
Marlene Roff Teacher. What is ASP in Web technology? Sherlyn Tenhundfeld Teacher. What is boxing and unboxing? Boxing is the process of converting a value type to the type object or to any interface type implemented by this value type. When the common language runtime CLR boxes a value type, it wraps the value inside a System. Object instance and stores it on the managed heap. Unboxing extracts the value type from the object. The following example shows how to set and get a serializable object with the SessionExtensions class:.
This property stores data until it's read in another request. The Keep String and Peek string methods can be used to examine the data without deletion at the end of the request. Keep marks all items in the dictionary for retention.
TempData is:. In the preceding markup, at the end of the request, TempData["Message"] is not deleted because Peek is used. Refreshing the page displays the contents of TempData["Message"]. The following markup is similar to the preceding code, but uses Keep to preserve the data at the end of the request:.
The maximum cookie size is less than bytes due to encryption and chunking. Most web clients such as web browsers enforce limits on the maximum size of each cookie and the total number of cookies. When using the cookie TempData provider, verify the app won't exceed these limits. Consider the total size of the data. Account for increases in cookie size due to encryption and chunking. A limited amount of data can be passed from one request to another by adding it to the new request's query string.
This is useful for capturing state in a persistent manner that allows links with embedded state to be shared through email or social networks. Because URL query strings are public, never use query strings for sensitive data. Any preserved session state must protect against CSRF attacks. Data can be saved in hidden form fields and posted back on the next request. This is common in multi-page forms. Because the client can potentially tamper with the data, the app must always revalidate the data stored in hidden fields.
The HttpContext. Items collection is used to store data while processing a single request. The collection's contents are discarded after a request is processed. The Items collection is often used to allow components or middleware to communicate when they operate at different points in time during a request and have no direct way to pass parameters.
In the following example, middleware adds isVerified to the Items collection:. For middleware that's only used in a single app, fixed string keys are acceptable. Middleware shared between apps should use unique object keys to avoid key collisions.
The following example shows how to use a unique object key defined in a middleware class:. Other code can access the value stored in HttpContext. Items using the key exposed by the middleware class:. Caching is an efficient way to store and retrieve data. The app can control the lifetime of cached items. For more information, see Response caching in ASP. Cached data isn't associated with a specific request, user, or session.
Do not cache user-specific data that may be retrieved by other user requests. To cache application wide data, see Cache in-memory in ASP. IDistributedCache' while attempting to activate 'Microsoft. This is typically caused by failing to configure at least one IDistributedCache implementation.
For more information, see Distributed caching in ASP. The session middleware can fail to persist a session if the backing store isn't available. For example, a user stores a shopping cart in session.
The user adds an item to the cart but the commit fails. The app doesn't know about the failure so it reports to the user that the item was added to their cart, which isn't true. The recommended approach to check for errors is to call await feature. CommitAsync when the app is done writing to the session.
CommitAsync throws an exception if the backing store is unavailable. If CommitAsync fails, the app can process the exception. LoadAsync throws under the same conditions when the data store is unavailable. SignalR apps should not use session state to store information.
SignalR apps can store per connection state in Context. Items in the hub. Host ASP. That said authentication is already handled by ASP. NET so User. Name would give the user name and storing a password for the whole duration of a session doesn't seems to make sense it is best for small, user scoped data you'll use very frequently so not for a user name which is already provided when using ASP.
NET built in authentication or for a password that seems usefull only at log time. For now my understanding is that session variable are not set. A session can be defined as a server-side storage of information that is desired to persist throughout the user's interaction with the web site or web application. How long do session variables last? The default value is actually 24 minutes seconds. Can we set session value in JavaScript? You can't access Session directly in JavaScript.
Javascript can not directly set session values. What is session in HTML? A session is a global variable stored on the server. Each session is assigned a unique id which is used to retrieve stored values. Just like cookies, the session must be started before any HTML tags. Can we use session in MVC? Session: is used to pass data across controllers in MVC Application. Session data never expires.
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