ASP.NET Interview Questions & Answers

1. What is ASP.NET?

ASP.NET is a development framework used to build web applications, developed by Microsoft as a server-side technology for creating dynamic web pages, web services, and applications.

1. What is the difference between ASP.NET and ASP?

ASP.NET is an advanced version of ASP which offers more powerful, flexible capabilities and performance. Compared to ASP, ASP.NET has better scalability, higher performance, richer controls and improved code management.

1. Could you please explain the page life cycle of ASP.NET?

The ASP.NET page lifecycle refers to the entire process of an ASP.NET page from creation to destruction, including different stages such as initialization, loading view state, handling user events, rendering, and unloading.

1. What is ViewState and what is its purpose?

ViewState is a mechanism in ASP.NET used for storing the state of a page. Its purpose is to maintain the state of the page between different page requests. By storing the page’s state in ViewState, it allows for data transfer and state preservation across pages.

1. Please explain the difference between controls in ASP.NET and HTML controls.

ASP.NET controls are server-side controls that can dynamically generate HTML controls and provide more functionality and event handling. In contrast, HTML controls are client-side controls that can only provide basic functionality and cannot interact with the server.

1. What is a Master Page and what is its function?

The Master Page in ASP.NET is a template for pages that defines a shared layout and design, including elements like headers, footers, and navigation bars. By using a Master Page, consistency and reusability can be achieved across pages.

1. What is AJAX and how does it relate to ASP.NET?

AJAX is a technology used to update parts of a webpage without refreshing the entire page, improving user experience by asynchronously exchanging data. ASP.NET offers a set of AJAX tools and controls to easily implement AJAX functionality.

1. What is the MVC pattern and how does it relate to ASP.NET?

MVC (Model-View-Controller) is a design pattern used to organize and manage applications, dividing them into three parts: model (data), view (user interface), and controller (logic processing). ASP.NET MVC is a development model for ASP.NET that separates pages and logic, providing improved maintainability and testability.

1. What is a Web API, and how does it relate to ASP.NET?

Web API is a technology used to build web services that can provide data and functionality to client applications using the HTTP protocol. ASP.NET Web API is a specific technology within ASP.NET that allows developers to easily create and publish Web APIs.

1. What are authorization and authentication, and what is their role in ASP.NET?

Authorization is the process of determining whether a user has permission to access a specific resource, while authentication is the process of verifying a user’s identity. In ASP.NET, authorization and authentication are used to secure applications, ensuring that only authorized users can access protected resources.