1) Explain the page life cycle of an ASP.NET page.
The page life cycle in ASP.NET includes five stages:
Page request, page initialization, page load, postback handling, and page rendering.
In the page request stage, the page is instantiated and objects such as the page itself and
any controls on it are created. In the page initialization stage,
any data is retrieved or initialized before the page loads. During the page load stage,
the page is loaded with all of its content, including control properties, view state data,
and user input. Postback handling is the stage where any user interaction, such as clicking a button,
is handled. Finally, the page is rendered and sent to the client in the page rendering stage.
2) What is the purpose of the Global.asax file in an ASP.NET application?
The Global.asax file is a global application file that contains event handlers for application level events,
such as Application_Start, Application_End, and Session_Start. It is used to initialize application wide variables,
create global objects, and handle application level events.
3) How can you improve the performance of an ASP.NET application?
Some ways to improve the performance of an ASP.NET application include reducing the number of postbacks,
using caching techniques, optimizing database queries, and minimizing the use of server side controls.
Developers can also use third party tools for code analysis and performance testing to identify any potential bottlenecks.
4) What is ViewState in ASP.NET?
ViewState is a hidden field on an ASP.NET page that stores the state of controls on the page, including their values, styles, and properties.
It is used to maintain the state of a web form across postbacks, allowing the page to remember user input and other changes made to the controls.
5) Explain the difference between server side and client side validation in ASP.NET.
Server side validation involves validating user input on the server before processing and saving it to the database.
It is typically done in the code behind file.
On the other hand, client side validation is done on the client side, usually through JavaScript, to validate user input before it is sent to the server.
This helps in preventing unnecessary postbacks and improves the user experience.
6) How do you implement authentication and authorization in ASP.NET?
ASP.NET provides various authentication and authorization mechanisms, such as Forms authentication, Windows authentication, and Authorization rules.
Forms authentication allows users to log in using a username and password stored in a database, while Windows authentication is based on a user's Windows credentials.
Authorization rules, on the other hand, allow developers to specify access rights for specific resources based on user roles.
7) What is cross site scripting (XSS), and how do you prevent it in ASP.NET?
Cross site scripting (XSS) is a security vulnerability that allows attackers to inject malicious scripts into web pages.
In ASP.NET, this can be prevented using measures such as input validation, output encoding, and use of the AntiXSS library.
It is also recommended to use HTTPS for all web applications to protect against XSS attacks.
8) What is the use of the ObjectDataSource control in ASP.NET?
The ObjectDataSource control allows developers to connect data bound controls, such as GridViews and ListViews, to a data source, such as a Business Object or a LINQ query.
It eliminates the need to write code for CRUD operations and simplifies data access in web applications.
9) How can you implement caching in ASP.NET?
Caching is a process of storing frequently requested data in memory for faster retrieval in the future.
In ASP.NET, developers can use various techniques to implement caching, such as Output Caching, Fragment Caching, and Data Caching.
It helps in improving application performance and reducing server load
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