What is the ASP.NET page life cycle and why is it important?What are application page life cycle events?Which is the first event in the page lifecycle Events?Name of the event that is not fired during page cycle?What events are raised during the Init phase of the page life cycle?What is the purpose of the LoadViewState and LoadPostData methods in the page life cycle?Can you describe the order in which events are raised during the Load phase of the page life cycle?What is the difference between the PreRender and PreRenderComplete events in the page life cycle?How do you handle user input or data changes during the page life cycle?Can you explain the role of the SaveViewState and SavePostData methods in the page life cycle?How does the Unload phase of the page life cycle work, and what tasks should be performed during this phase?Can you describe any scenarios where you would need to override specific methods in the page life cycle to customize the behavior of an ASP.NET page?Can you describe any differences or considerations when working with master pages and user controls within the ASP.NET page life cycle?What is Master Page in Asp.net and how to use?What’s the use of "GLOBAL.ASAX" file?What are the major events in global.asax?What event handlers can I include in Global.asax?How can we apply themes in asp.net?Difference between ASP.Net Website and ASP.Net Web Application?Can an ASPX file contain more than one form marked with runat equal server in ASP.NET?What is the name of class from which web pages are inherited in ASP.NET?What is the difference between Codebehind="MyCode.aspx.cs" and Src="MyCode.aspx.cs" in ASP.NET?Can I use different programming languages in the same .NET application?Can the App_Code folder contain source code files in different programming languages?What is the name of the virtual page that you can request to view trace data when the trace data is not displayed on its corresponding Web page?Which of the following browser capabilities can you not check using Request.Browser?You catch an unhandled exception in a Page_Error handler. How can you access the last error?Is it possible to add APP_Code folder in web application project in Visual Studio?What is the difference between the Theme and StylesheetTheme?How you can determine whether client is connected to server or not?
What is the purpose of the web.config file in ASP.NET?Where is the web.config file located in an ASP.NET application?What are some common sections or elements found in the web.config file?What is the root tag of web.config file?What is custom tag in web.config file?Does Web.config file is case-sensitive?In which format web.config file is stored?Can one directory contains multiple web.config files?What is the purpose of machine.config file?If we remove a web.config file from the application, does this application will work?In an ASP.NET website, when the web.config file is getting called?What will happened if Someone types the URL of web.config file in the browser?For which purpose appsettings tag is used?Can you explain the significance of the and sections in the web.config file?How can you configure application-wide settings such as connection strings, app settings, and custom error pages in the web.config file?Can you describe the role of the section in the web.config file and its impact on ASP.NET application performance?How can you configure authentication and authorization settings in the web.config file?What are the different modes of session state management that can be configured in the web.config file?How can you configure custom HTTP modules and handlers in the web.config file?Can you explain how to set up URL rewriting or routing rules in the web.config file?What are some best practices for managing and securing the web.config file in an ASP.NET application?Which element is used to apply a theme to the current application within the web.config?Is it possible to read Web.config or Global.asax files from browser?Can you tell the location of root web.config file from which all web.config get inherit?What is the use of custom error tag in web.config file?Can you describe the funcitonality of httpHandlers tab in web.config file?
What is an HttpHandler in ASP.NET, and what is its purpose?How is an HttpHandler different from an ASP.NET web page?Can you explain the life cycle of an HttpHandler?What are the advantages of using HttpHandlers in ASP.NET?How would you implement a custom HttpHandler in ASP.NET?Can you explain the concept of routing in ASP.NET and how it relates to HttpHandlers?How can you restrict access to an HttpHandler based on user roles or permissions?Have you used any third-party HttpHandlers in your projects? If so, which ones and why?What is an HttpModule in ASP.NET, and what is its purpose?How does an HttpModule differ from an HttpHandler?Can you explain the life cycle of an HttpModule?What are some common scenarios where you would use an HttpModule?How can you modify or intercept incoming requests using an HttpModule?Can you explain the life cycle of an HttpModule?Can you give an example of how you would implement a custom HttpModule in ASP.NET?Have you used any built-in or third-party HttpModules in your projects? If so, which ones and why?How can you handle errors or exceptions using an HttpModule?
What is ViewState in ASP.NET and why is it used?How does ViewState work in ASP.NET web pages?Can you explain the purpose of the ViewState hidden field?What is the role of ViewState in maintaining the state of controls on a web page during postbacks?How can you enable or disable ViewState for individual controls in ASP.NET?What are the advantages of using ViewState in ASP.NET web pages?What are the potential drawbacks or considerations when working with ViewState?How can you optimize ViewState usage to minimize its impact on performance?Can you explain the impact of ViewState on the size of the rendered HTML page?How can you secure the contents of the ViewState from tampering or unauthorized access?How to check viewstate tampering?Can you describe any alternatives or strategies you have used to manage state without relying heavily on ViewState?What is the lifespan for items stored in ViewState?Does ViewState is encrypted?What is ViewState Chunking?Does ViewState get lost if a user refreshes a Web page?What will happen with ViewState if the user copies the URL and open it in other browser?What Is The Difference Between ViewState and Session?Does ViewState is responsible for maintaining data across the Page PostBack for Postback and non-postback controls?Which method will you use to Delete the ViewState information for all the server and child control(s)?How many ViewState objects can be created on an aspx page?Can I make ViewState enabled for controls where Enableviewstate of the container page is set to false?
What is control state in ASP.NET Web Forms?How does control state differ from ViewState?What is the purpose of using control state in web forms?How do you enable and configure control state for a control?Can you explain the process of storing and retrieving control state data?What are the benefits of using control state over view state?How does control state ensure that a controls state is preserved even if ViewState is disabled?What are the considerations for using control state effectively?How do you handle security considerations when using control state?Can you describe any challenges or limitations when working with control state in ASP.NET Web Forms?What are some common use cases for using control state in web forms?Have you encountered any specific scenarios where control state was essential in your ASP.NET projects? If so, how did you utilize it?
What is a hidden field in ASP.NET Web Forms?How is a hidden field rendered in the HTML markup?What is the purpose of using hidden fields in ASP.NET web forms?How do you create and use hidden fields in ASP.NET Web Forms?Can you explain the difference between ViewState and hidden fields?How can you access the value of a hidden field in server-side code?How do you handle security considerations when using hidden fields?What are some common use cases for using hidden fields in web forms?Can you describe any challenges or limitations when working with hidden fields in ASP.NET Web Forms?How do hidden fields affect page size and performance?What are the alternatives to using hidden fields in ASP.NET Web Forms?Have you encountered any specific scenarios where hidden fields were essential in your ASP.NET projects? If so, how did you utilize them?
What are cookies in the context of ASP.NET web development?How are cookies used in ASP.NET web applications?Explain the process of setting a cookie in an ASP.NET web page?What are the main components of a cookie?Can you explain the different types of cookies in ASP.NET?What is the purpose of the Expires property of a cookie? How is it used?How can you retrieve the value of a cookie in an ASP.NET web page?How do you delete a cookie in ASP.NET?What are the security considerations when working with cookies in ASP.NET?Can you explain the concept of cookieless sessions in ASP.NET?How do you handle cookie size limitations in ASP.NET?What is Cookie Munging?What is Cookie Dictionary?Is it possible to create cookies with keys? Explain using some example?What are the advantages and disadvantages of Cookies? Explain using some example?What is the maximum Data that can be stored in a cookie?What is the maximum number of cookies that can be allowed to a web site?How to turn off cookies for one page in your site in ASP.NET?How do you create a permanent cookie?What is persistent and nonpersistent cookie?Is it possible that cookies created by asp.net application can only be accessed via server side code only?Is it possible to restrict that client side code can not access any cookie?If a users has disabled cookies in his browsers, what can be done to enable forms authentication?What are the different level of settings available for configure cookies in browser?Have you encountered any issues related to cross-domain cookies in your ASP.NET projects? If so, how did you handle them?
What are Query Strings in the context of ASP.NET web pages?How are Query Strings used to pass data between web pages in ASP.NET?Can you explain the structure and format of a Query String in a URL?How can you retrieve the value of a Query String parameter in an ASP.NET web page?What are the limitations or considerations when working with Query Strings in ASP.NET?How do you handle URL encoding and decoding when using Query Strings in ASP.NET?Can you explain the security implications of passing sensitive data through Query Strings?How can you manipulate or modify Query String values programmatically in ASP.NET?What are the best practices for using Query Strings in ASP.NET web pages?How do you handle cases where a Query String parameter is missing or invalid in an ASP.NET web page?Have you encountered any challenges or issues related to Query Strings in your ASP.NET projects? If so, how did you address them?Can you describe any alternatives or strategies you have used to pass data between pages without relying heavily on Query Strings?
What is session state in ASP.NET?How is session state managed in ASP.NET Web Forms?What method do you use to explicitly kill a users session?Where does ASP.Net stores sessionIDs by default?What is the size of the session ID?How can we disable session for an ASP.NET Application?How can we disable session in Page Level?Can we use session variable in App_code Class page?Does SessionID change with every request in the asp.net application?Difference between ASP Session and ASP.NET Session?What is the difference between Session.Clear() and Session.RemoveAll() method?Do session use cookies?Explain Cookie-Less session in asp.netWhat is the best state management variable to save the username for particular session?Can you give an example of what might be best suited to place in the Application_Start and Session_Start subroutines?What is the difference between Application and Session object?Which typically consumes more memory: application state or session state?Which might not work if a user has disabled cookies in his or her Web browser: application state or session state?Can you explain the difference between in-process and out-of-process session state modes?What are the various session state modes available in ASP.NET, and how do they differ?How do you enable and configure session state in an ASP.NET Web Forms application?Can you describe the role and usage of the Session object in ASP.NET?How do you store and retrieve data in session state?What are the considerations and best practices for managing session state effectively?How do you handle session timeouts and expiration in ASP.NET Web Forms?What are the options for storing session state out-of-process, and how do they differ?Can you explain how session state is maintained in a web farm or load-balanced environment?Session_end() event is suppported by which session mode only?What are the advantages and disadvantages of state server(outproc) session mode?What are the advantages and disadvantages of SQL Server session mode?What is the default mode for Session State in ASP.NET?What is the difference between cache and session?What is the difference between HttpContext.Current.Items and HttpContext.Current.Session in ASP.NET?Is it possible to set SessionState to readonly mode? Readonly mode means, we can only read data from session but we can not write any data in session variable?Is it possible to use InProc mode for sessionState in case of web garden?Have you encountered any challenges or issues related to session state management in your ASP.NET projects? If so, how did you address them?
What is Application State in ASP.NET and how is it different from other state management techniques?How is Application State stored and accessed in an ASP.NET application?What are the benefits of using Application State for state management?Can you explain the scope and lifetime of Application State in an ASP.NET application?What are the considerations for storing complex objects in the Application State?Can you explain the difference between Application State and Session State in ASP.NET?How can you handle concurrency and thread safety when working with Application State?What are the potential performance implications of using Application State in an ASP.NET application?How do you manage the size and memory usage of the Application State?Have you encountered any challenges or limitations when using Application State in your ASP.NET projects? If so, how did you address them?Can you describe any scenarios where you would choose to use Application State over other state management techniques in ASP.NET?
Previous
Next

How does ViewState work in ASP.NET web pages?

In ASP.NET web pages, ViewState works behind the scenes to persist and restore the state of controls between postbacks. It ensures that control values, such as textbox entries or selected options in dropdown lists, are maintained across page requests. Here's an overview of how ViewState works in ASP.NET web pages:

  1. Enabling ViewState: ViewState is enabled at the page or control level by setting the 'EnableViewState' property to 'true'. By default, ViewState is enabled for most web controls. You can also enable or disable ViewState programmatically.
  2. Saving Control State: During the page lifecycle, when a postback occurs (such as a button click), the ASP.NET framework automatically saves the state of controls in their respective ViewState. This happens in the 'SaveViewState' phase, after the 'LoadViewState' phase of the page lifecycle.
  3. ViewState Serialization: The control state data is serialized into a hidden field called '__VIEWSTATE'. This hidden field is part of the HTML output generated by the ASP.NET framework and is sent to the client's browser.
  4. Client-Server Communication: When the page is submitted back to the server, either through a postback or a form submission, the '__VIEWSTATE' field is sent back to the server as part of the request payload.
  5. ViewState Deserialization: On the server, during the LoadViewState phase of the page lifecycle, the '__VIEWSTATE' field is deserialized, and the control state is restored.
  6. Control Population: The restored control state is used to populate the controls with their previous values, allowing the page to appear as if it was never refreshed.
  7. Accessing ViewState Data: Developers can access ViewState data in server-side code, such as event handlers or page methods, to retrieve and utilize the preserved values of controls. The control properties can be accessed as usual.

It's important to note that ViewState is specific to a single page and is not shared between different pages. Each page has its own '__VIEWSTATE' field that holds the state data for that particular page.

While ViewState simplifies the management of control state, it adds overhead to the page size and increases network traffic. Therefore, it's crucial to use ViewState judiciously and consider alternative mechanisms like session state, control-specific state management, or client-side state storage for large or sensitive data.

By default, ViewState is encrypted and tamper-resistant, providing a level of security for the transferred state data. However, it is not designed to securely store sensitive information. If you have sensitive data, you should consider other secure storage options.

Previous
Next