ASP.NET Interview Questions and Answers - Beginner Level (Part 1)

Posted by: suprotim agarwal , on 6/16/2007, in Category Interview Questions
Views: 426924
Abstract: The ASP.NET interview questions and answers mentioned over here are usually asked to freshers/beginners or developers having less than 1 year of relevant experience.

This article was updated on June 16 2016.

The ASP.NET Questions and answers mentioned over here have been taken from forums, my colleagues and my own experience of conducting interviews. The ASP.NET interview questions and answers mentioned here can be used by freshers, or developers with 2 or more years of experience.

ASP.NET Interview Q&A for Freshers

What is ASP.NET?

Microsoft ASP.NET is an open source server side technology that enables programmers to build dynamic Web sites, web applications, and Web services. It is a part of the .NET based environment and is built on the Common Language Runtime (CLR) . So programmers can write ASP.NET code using any .NET compatible language.

ASP.NET Core is the next successor to ASP.NET. It was first called as ASP.NET 5, but to avoid confusing developers that it is an update to the existing ASP.NET framework, Microsoft renamed it to ASP.NET Core. It has been re-implemented as a modular framework. ASP.NET Core uses the .NET Compiler Platform ("Roslyn") which is open source and cross platform. You can read about ASP.NET Core over here

What are the differences between ASP.NET 1.1 and ASP.NET 2.0?

A comparison chart containing the differences between ASP.NET 1.1 and ASP.NET 2.0 can be found over here.

Which is the latest version of ASP.NET? What were the previous versions released?

The latest version of ASP.NET is 2.0. There have been 3 versions of ASP.NET released as of date. They are as follows :

v1.0 – Released on January 16, 2002.

v1.1 – Released on April 24, 2003.

v2.0 – Released on November 7, 2005.

v3.0 – Released on November 1, 2006

v3.5 – Released on November 19, 2007

v3.5 SP1 - Released on August 11, 2008

v4.0 – Released on April 12, 2010

v4.5 – Released on August 15, 2012

v4.5.1 – Released on October 17, 2013

v4.5.2 -  Released on May 5, 2014

v4.6 - Released on July 20, 2015

ASP.NET Core (Currently in RC1) – Released on November 18, 2015

Explain the Event Life cycle of ASP.NET 2.0?

The events occur in the following sequence. Its best to turn on tracing(<% @Page Trace=”true”%>) and track the flow of events :

PreInit – This event represents the entry point of the page life cycle. If you need to change the Master page or theme programmatically, then this would be the event to do so. Dynamic controls are created in this event.

Init – Each control in the control collection is initialized.

Init Complete* - Page is initialized and the process is completed.

PreLoad* - This event is called before the loading of the page is completed.

Load – This event is raised for the Page and then all child controls. The controls properties and view state can be accessed at this stage. This event indicates that the controls have been fully loaded.

LoadComplete* - This event signals indicates that the page has been loaded in the memory. It also marks the beginning of the rendering stage.

PreRender – If you need to make any final updates to the contents of the controls or the page, then use this event. It first fires for the page and then for all the controls.

PreRenderComplete* - Is called to explicitly state that the PreRender phase is completed.

SaveStateComplete* - In this event, the current state of the control is completely saved to the ViewState.

Unload – This event is typically used for closing files and database connections. At times, it is also used for logging some wrap-up tasks.

The events marked with * have been introduced in ASP.NET 2.0. Here’s an overview of the Application Lifecycle architecture.

aspnet lifecycle architecture

To understand the life cycle in detail with diagrams, refer to our article ASP.NET Application and Page Life Cycle Overview

You have created an ASP.NET Application. How will you run it?

With ASP.NET 2.0, Visual Studio comes with an inbuilt ASP.NET Development Server to test your pages. It functions as a local Web server. The only limitation is that remote machines cannot access pages running on this local server. The second option is to deploy a Web application to a computer running IIS version 5 or 6 or 7.

ASP.NET Core applications are host agnostic i.e they can be run on IIS or even standalone.

Explain the AutoPostBack feature in ASP.NET?

AutoPostBack allows a control to automatically postback when an event is fired. For eg: If we have a Button control and want the event to be posted to the server for processing, we can set AutoPostBack = True on the button.

How do you disable AutoPostBack?

Hence the AutoPostBack can be disabled on an ASP.NET page by disabling AutoPostBack on all the controls of a page. AutoPostBack is caused by a control on the page.

What are the different code models available in ASP.NET 2.0?

There are 2 code models available in ASP.NET 2.0. One is the single-file page and the other one is the code behind page.

Which base class does the web form inherit from?

Page class in the System.Web.UI namespace.

Which are the new special folders that are introduced in ASP.NET 2.0?

There are seven new folders introduced in ASP.NET 2.0 :

\App_Browsers folder – Holds browser definitions(.brower) files which identify the browser and their capabilities.

\App_Code folder – Contains source code (.cs, .vb) files which are automatically compiled when placed in this folder. Additionally placing web service files generates a proxy class(out of .wsdl) and a typed dataset (out of .xsd).

\App_Data folder – Contains data store files like .mdf (Sql Express files), .mdb, XML files etc. This folder also stores the local db to maintain membership and role information.

\App_GlobalResources folder – Contains assembly resource files (.resx) which when placed in this folder are compiled automatically. In earlier versions, we were required to manually use the resgen.exe tool to compile resource files. These files can be accessed globally in the application.

\App_LocalResources folder – Contains assembly resource files (.resx) which can be used by a specific page or control.

\App_Themes folder – This folder contains .css and .skin files that define the appearance of web pages and controls.

\App_WebReferences folder – Replaces the previously used Web References folder. This folder contains the .disco, .wsdl, .xsd files that get generated when accessing remote web services.

Explain the ViewState in ASP.NET?

Http is a stateless protocol. Hence the state of controls is not saved between postbacks. Viewstate is the means of storing the state of server side controls between postbacks. The information is stored in HTML hidden fields. In other words, it is a snapshot of the contents of a page.

You can disable viewstate by a control by setting the EnableViewState property to false.

What does the EnableViewState property signify?

EnableViewState saves the state of an object in a page between postbacks. Objects are saved in a Base64 encoded string. If you do not need to store the page, turn it off as it adds to the page size.

There is an excellent article by Peter Bromberg to understand Viewstate in depth.

Explain the ASP.NET Page Directives?

Page directives configure the runtime environment that will execute the page. The complete list of directives is as follows:

@ Assembly - Links an assembly to the current page or user control declaratively.

@ Control - Defines control-specific attributes used by the ASP.NET page parser and compiler and can be included only in .ascx files (user controls).

@ Implements - Indicates that a page or user control implements a specified .NET Framework interface declaratively.

@ Import - Imports a namespace into a page or user control explicitly.

@ Master - Identifies a page as a master page and defines attributes used by the ASP.NET page parser and compiler and can be included only in .master files.

@ MasterType - Defines the class or virtual path used to type the Master property of a page.

@ OutputCache - Controls the output caching policies of a page or user control declaratively.

@ Page - Defines page-specific attributes used by the ASP.NET page parser and compiler and can be included only in .aspx files.

@ PreviousPageType - Creates a strongly typed reference to the source page from the target of a cross-page posting.

@ Reference - Links a page, user control, or COM control to the current page or user control declaratively.

@ Register - Associates aliases with namespaces and classes, which allow user controls and custom server controls to be rendered when included in a requested page or user control.

This list has been taken from here.

Explain the Validation Controls used in ASP.NET 2.0?

Validation controls allows you to validate a control against a set of rules. There are 6 different validation controls used in ASP.NET 2.0.

RequiredFieldValidator – Checks if the control is not empty when the form is submitted.

CompareValidator – Compares the value of one control to another using a comparison operator (equal, less than, greater than etc).

RangeValidator – Checks whether a value falls within a given range of number, date or string.

RegularExpressionValidator – Confirms that the value of a control matches a pattern defined by a regular expression. Eg: Email validation.

CustomValidator – Calls your own custom validation logic to perform validations that cannot be handled by the built in validators.

ValidationSummary – Show a summary of errors raised by each control on the page on a specific spot or in a message box.

How do you identify that the page is post back?

By checking the IsPostBack property. If IsPostBack is True, the page has been posted back.

What are Master Pages?

Master pages is a template that is used to create web pages with a consistent layout throughout your application. Master Pages contains content placeholders to hold page specific content. When a page is requested, the contents of a Master page are merged with the content page, thereby giving a consistent layout.

How is a Master Page different from an ASP.NET page?

The MasterPage has a @Master top directive and contains ContentPlaceHolder server controls. It is quiet similar to an ASP.NET page.

How do you attach an existing page to a Master page?

By using the MasterPageFile attribute in the @Page directive and removing some markup.

<%@ Page Language="C#" MasterPageFile="~/Template.master" AutoEventWireup="true" 
CodeFile="About.aspx.cs" Inherits="UI.About" 
Title="Your Page Title" %>

How do you set the title of an ASP.NET page that is attached to a Master Page?

By using the Title property of the @Page directive in the content page. Eg:

<@Page MasterPageFile="Sample.master" Title="I hold content" %>

What is a nested master page? How do you create them?

A Nested master page is a master page associated with another master page. To create a nested master page, set the MasterPageFile attribute of the @Master directive to the name of the .master file of the base master page.

What are Themes?

Themes are a collection of CSS files, .skin files, and images. They are text based style definitions and are very similar to CSS, in that they provide a common look and feel throughout the website.

What are skins?

A theme contains one or more skin files. A skin is simply a text file with a .skin extension and contains definition of styles applied to server controls in an ASP.NET page. For eg:

<asp:button runat="server" BackColor="blue" BorderColor="Gray" Font-Bold ="true"ForeColor="white"/>

Defines a skin that will be applied to all buttons throughout to give it a consistent look and feel.

What is the difference between Skins and Css files?

Css is applied to HTML controls whereas skins are applied to server controls.

What is a User Control?

User controls are reusable controls, similar to web pages. They cannot be accessed directly.

Explain briefly the steps in creating a user control?

  • Create a file with .ascx extension and place the @Control directive at top of the page.
  • Included the user control in a Web Forms page using a @Register directive

What is a Custom Control?

Custom controls are compiled components that run on the server and that encapsulate user-interface and other related functionality into reusable packages. They can include all the design-time features of standard ASP.NET server controls, including full support for Visual Studio design features such as the Properties window, the visual designer, and the Toolbox.

What are the differences between user and custom controls?

User controls are easier to create in comparison to custom controls, however user controls can be less convenient to use in advanced scenarios.

User controls have limited support for consumers who use a visual design tool whereas custom controls have full visual design tool support for consumers.

A separate copy of the user control is required in each application that uses it whereas only a single copy of the custom control is required, in the global assembly cache, which makes maintenance easier.

A user control cannot be added to the Toolbox in Visual Studio whereas custom controls can be added to the Toolbox in Visual Studio.

User controls are good for static layout whereas custom controls are good for dynamic layout.

Where do you store your connection string information?

The connection string can be stored in configuration files (web.config).

What is the difference between ‘Web.config’ and ‘Machine.config’?

Web.config files are used to apply configuration settings to a particular web application whereasmachine.config file is used to apply configuration settings for all the websites on a web server.

Web.config files are located in the application's root directory or inside a folder situated in a lower hierarchy. The machine.config is located in the Windows directory Microsoft.Net\Framework\Version\CONFIG.

There can be multiple web.config files in an application nested at different hierarchies. However there can be only one machine.config file on a web server.

What is the difference between Server.Transfer and Response.Redirect?

Response.Redirect involves a roundtrip to the server whereas Server.Transfer conserves server resources by avoiding the roundtrip. It just changes the focus of the webserver to a different page and transfers the page processing to a different page.

Response.Redirect can be used for both .aspx and html pages whereas Server.Transfer can be used only for .aspx pages.

Response.Redirect can be used to redirect a user to an external websites. Server.Transfer can be used only on sites running on the same server. You cannot use Server.Transfer to redirect the user to a page running on a different server.

Response.Redirect changes the url in the browser. So they can be bookmarked. Whereas Server.Transfer retains the original url in the browser. It just replaces the contents of the previous page with the new one.

What method do you use to explicitly kill a users session?


What is a webservice?

Web Services are applications delivered as a service on the Web. Web services allow for programmatic access of business logic over the Web. Web services typically rely on XML-based protocols, messages, and interface descriptions for communication and access. Web services are designed to be used by other programs or applications rather than directly by end user. Programs invoking a Web service are called clients. SOAP over HTTP is the most commonly used protocol for invoking Web services.

Check out some more ASP.NET Interview Questions and Answers for Freshers and Experienced Developers at ASP.NET 2.0 Interview Questions - Intermediate Level

Note: I have tried to mention the contributor wherever possible. If you would like to contribute, kindly use the Contact form. If you think that a credit for a contribution is missing somewhere, kindly use the same contact form and I will do the needful.

Check out some other .NET, ASP.NET and C# interview questions and answers for developers over here:

General .NET Interview Questions

.NET Framework Interview Questions

ASP.NET 2.0 Interview Questions - Intermediate Level

This article has been editorially reviewed by Suprotim Agarwal.

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please correct this answer
Explain the AutoPostBack feature in ASP.NET?

AutoPostBack allows a control to automatically postback when an event is fired. For eg: If we have a Button control and want the event to be posted to the server for processing, we can set AutoPostBack = True on the button.(button Control we dont have AutoPostBack Property)
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Nice article and very helpful.

Readers please make sure the answers are correct before you proceed.
For example, Release date of versions are incorrect in this article. Please refer Wikipedia link: for the correct release date and versions of

Comment posted by Web05 on Friday, October 26, 2012 11:29 AM
Nice article and very helpful.

Readers please make sure the answers are correct before you proceed.
For example, Release date of versions are incorrect in this article. Please refer Wikipedia link: for the correct release date and versions of

Comment posted by Suprotim Agarwal on Tuesday, October 30, 2012 2:35 AM
@Web05 Please note that ASP.NET does not mean .NET Framework. ASP.NET is one of the technologies in .NET Framework. The link you posted does not relate to this article. The correct link is
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Comment posted by vishal on Friday, July 26, 2013 7:40 AM
nice one..
Comment posted by umarani on Thursday, October 31, 2013 4:38 AM
very useful
Comment posted by tyuty on Tuesday, November 12, 2013 3:50 AM
Comment posted by KALE on Tuesday, November 26, 2013 4:04 AM
Comment posted by Rohan on Sunday, January 12, 2014 5:44 PM
Good info to start with
Comment posted by Jim on Tuesday, June 3, 2014 9:27 PM
these are some of the dopiest questions I've seen.
they don't represent any understanding of concepts, only memorization.
what the purpose, really?
but thanks for the effort.
Comment posted by ayub on Tuesday, August 26, 2014 10:39 AM
Comment posted by sandip on Thursday, September 25, 2014 6:41 AM
very useful,Thanx sir
Comment posted by jay on Monday, December 22, 2014 9:55 PM
good one
Comment posted by Raju chilaka on Tuesday, January 20, 2015 3:35 AM
Simple and super sir!send me more interview questions
Comment posted by Bharat sharma on Monday, April 20, 2015 12:12 AM
very useful and esay,thanks sir ji
Comment posted by johnd on Wednesday, May 6, 2015 12:16 AM
Nice collection...below is another link for the best collection of  ASP.NET interview questions and answers,