ASP.net Interview Questions and Answers

The prime difference between these two is that ASP is interpreted platform as scripts are being used, whereas ASP.NET is a compiled platform because of its pages using .NET languages. All the ASP.NET pages are MSIL (Microsoft Intermediate Language) compiled.

Internet Information Server or IIS is developed by Microsoft with its own operating system. It is used to execute web page scripts. It works in between ASP.NET engine and browser to process chrome requests and responses are submitted back.

An ASP.NET page goes through a series of stages in the life cycle as following,

Page Request => Start => Initialization => Load =>Postback Event Handling => Rendering => Unload

Both ASP.NET Web Forms and MVC are tolls with different strengths and workability. Web Forms are used to create web apps with ASP.NET and utilize designer and server controls to design a form with a point and click interface, whereas VMS is used to separate as web app into data, actions and display.

There are five primary session state modes present in ASP.NET.

• InProc Mode – Stores session state in the web server memory
• StateServer Mode – Stores session in ASP.NET state service
• SQLServer Mode – Store the session state in a SQL database
• Custom Mode – Developers can specify the storage provider here
• Off Mode – Completely disables the session state

Server.Transfer sends information from one web request to another on the server side, But, Response.Redirect sends an HTTP 302 message to the browser and implements a redirect in the browser.

Here are the few most used ASP.NET validators by developers:

• Required Field Validator
• Range Validator
• Compare Validator
• Summary Validator
• Regular Expression Validator
• Custom Validator

An ASP.NET validator controls validate the user input data. Whenever the user shares an input, it must validate them before sending it across various layers of the application.

There are two types of validation used in ASP.NET:

• Client-side validation
• Server-side validation

It is used to retain the state of the server-side objects between page postbacks. After the page postback, it is stored in a hidden field on the page at the client side. It is transported to both client and server side, and not stored on the server or any other external source.

The caching technique is used to increase performance level in ASP.NET by keeping frequently accesses files or data in memory. The request for a cached data/file will be directly obtained from the cache instead of the actual location of that data or file.

ASP.NET has three types of caching:

• Data Caching
• Fragment Caching
• Output Caching