what is the use of view state in asp net with example

What is ASP.NET enable ViewState?

View state enables a server control to maintain its state across HTTP requests. View state for a control is enabled if all of the following conditions are met: The EnableViewState property for the page is set to true . The EnableViewState property for the control is set to true .

What is IsPostBack in ASP.NET with example?

IsPostBack is a property of the Asp.Net page that tells whether or not the page is on its initial load or if a user has perform a button on your web page that has caused the page to post back to itself. The value of the Page.

What is view in ASP NET MVC?

A view is an HTML template with embedded Razor markup. Razor markup is code that interacts with HTML markup to produce a webpage that's sent to the client. In ASP.NET Core MVC, views are .cshtml files that use the C# programming language in Razor markup.Feb 18, 2022

What is ASP framework?

ASP.NET is a free web framework for building great websites and web applications using HTML, CSS, and JavaScript. You can also create Web APIs and use real-time technologies like Web Sockets. ASP.NET Core is an alternative to ASP.NET.Feb 19, 2020

What is Ajax explain with example?

AJAX = Asynchronous JavaScript and XML. AJAX is a technique for creating fast and dynamic web pages. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

What is master page in ASP.NET with example?

A master page is an ASP.NET file with the extension . master (for example, MySite. master) with a predefined layout that can include static text, HTML elements, and server controls. The master page is identified by a special @ Master directive that replaces the @ Page directive that is used for ordinary . aspx pages.Oct 22, 2014

Why do we use ViewState?

View state is used automatically by the ASP.NET page framework to persist information that must be preserved between postbacks. This information includes any non-default values of controls. You can also use view state to store application data that is specific to a page.Oct 22, 2014

What is the use of the EnableViewState property?

Explain the purpose of EnableViewState property. - It allows the page to save the users input on a form across postbacks. - It saves the server-side values for a given control into ViewState, which is stored as a hidden value on the page before sending the page to the clients browser.

How can we store and retrieve values ViewState?

If you need to store extraneous information in ViewState, you can get and set data in ViewState like you would any other key/value collection: //store value in viewstate ViewState["someValue"] = "Foo"; //retrieve value from viewstate string someValue = ViewState["someValue"]. ToString();Nov 3, 2011

What is view state?

View State is the method to preserve the Value of the Page and Controls between round trips. It is a Page-Level State Management technique. View State is turned on by default and normally serializes the data in every control on the page regardless of whether it is actually used during a post-back.

What are the disadvantages of view state?

Security Risk: The Information of View State can be seen in the page output source directly. You can manually encrypt and decrypt the contents of a Hidden Field, but It requires extra coding.

Why does a round trip happen?

It only happens because all the controls are classes and on the server all the Control Objects are created and then after the round trip the Page is returned to the client's browser in HTML format and the objects are destroyed at the server.

What happens after clicking on the submit button?

After clicking on the Submit Button the value of user name and password is submitted in View State and the View State stores the value of user name and password during post-back.

Why is a web application stateless?

It only happens because of one server, all the controls of the Web Page is created and after the round trip the server destroys all the instances. So to retain the values of the controls we use state management techniques.

Why is performance not good?

Performance: Performance is not good if we use a large amount of data because View State is stored in the page itself and storing a large value can cause the page to be slow.

Is view state data secure?

View State Data is stored in the form of Base 64 encoding but it is not more secure, anyone can easily break it. So there are the following 2 options,

What is View State in ASP.NET?

View State is one of the methods of the ASP.NET page framework used to preserve and store the page and control values between round trips. It is maintained internally as a hidden field in the form of an encrypted value and a key.

What are the Features of the View State in ASP.NET?

The view state persists the ASP.NET page framework's control settings between post-backs and sessions. You can use the view state to do the following:

What are the Disadvantages of View State?

Along with the benefits, the View State also comes with a few prominent drawbacks that may put a developer in a dilemma of "to use it or not to use it" based on their needs. Some of those drawbacks are:

When Should You Use View State?

The use cases of View State vary from person to person, depending on individual needs and priorities. However, the most common scenarios of their use are:

How to Enable and Disable View State?

View State can be enabled and disabled for a single control as well as at the page level. Set the EnableViewState attribute of a single control to false to disable View State for that control.

Conclusion

View State provides the state information and control values of a specific ASP.NET page. If you need to access that data across multiple pages or throughout your website, consider using other state management techniques like application state, session state, or profile properties.

About the Author

Taha is a Research Analyst at Simplilearn. He is passionate about building great user interfaces and keeps himself updated on the world of Artificial Intelligence. Taha is also interested in gaming and photography.

What is view state in ASP.NET?

View state is a repository in an ASP.NET page that can store values that have to be retained during post back. The page framework uses view state to persist control settings between postbacks.

How to use view state?

You can use view state in your own applications to do the following: 1 Keep values between postbacks without storing them in session state or in a user profile. 2 Store the values of page or control properties that you define. 3 Create a custom view state provider that lets you store view state information in a SQL Server database or in another data store.

How does viewstateuserkey work?

If a Web site authenticates users, you can set the ViewStateUserKey property in the Page_Init event handler to associate the page's view state with a specific user. This helps prevent one-click attacks, in which a malicious user creates a valid, pre-filled Web page with view state from a previously created page. The attacker then lures a victim into clicking a link that sends the page to the server by using the victim's identity.

What is MAC key?

The MAC key that is used to compute the view state hash value is either auto-generated or specified in the Machine.config file. If the key is auto-generated, it is created based on the MAC address of the computer, which is the unique GUID value of the network adapter in that computer.

How to access view state information?

You can access view state information by using the page's ViewState property, which exposes a dictionary object. You can use this dictionary to store custom values. A typical use is to store the value of custom properties that you define in the page.

What is view state?

View state information is serialized into XML and then encoded by using base-64 encoding, which can generate large amounts of data. When the page is posted to the server, the contents of view state are sent as part of the page postback information.

How does view state affect performance?

If view state contains a large amount of information, it can affect performance of the page. Test the performance of your pages by using typical data for your application to determine whether the size of view state is causing performance problems.

What is control state in ASP.NET?

Control state, introduced in ASP.NET version 2.0, is similar to view state but functionally independent of view state. A page developer can disable view state for the page or for an individual control for performance. However, control state cannot be disabled.

When to use control state?

Use control state only for small amounts of critical data that are essential for the control across postbacks. Do not use control state as an alternative to view state. The example illustrates a custom control that saves state in both control state and view state.