ASP.NET Interview Questions and Answers, ASP.NET Interview Questions and Answers Freshers, ASP.NET Interview Questions and Answers, ASP.NET Interview Questions
Before getting on to the ASP.NET interview questions, the student must know that the ASP.NET is a continuously varying field which needs the students as well as professionals to upgrade their skills with the new features and knowledge, to get fit for the jobs associated with ASP.NET. This post related to ASP.NET Interview Questions and Answers, ASP.NET Interview Questions and Answers Freshers, ASP.NET Interview Questions and Answers, ASP.NET Interview Questions will help you let out find all the solutions that are frequently asked in you upcoming ASP.NET interview.
Over thousands of vacancies available for the ASP.NET developers, experts must be acquaintance with all the component of ASP.NET technologies. This is necessary for the students in order to have in-depth knowledge of the subject so that they can have best employment opportunities in the future. Knowing every little detail about ASP.NET is the best approach to solve the problems linked with problem.
APTRON has spent hours and hours in researching about the ASP.NET Interview Questions and Answers, ASP.NET Interview Questions and Answers Freshers, ASP.NET Interview Questions and Answers, ASP.NET Interview Questions that you might encounter in your upcoming interview. All these questions will alone help you to crack the interview and make you the best among all your competitors.
First of all, let us tell you about how the ASP.NET technology is evolving in today’s world and how demanding it is in the upcoming years. In fact, according to one study, most of the companies and businesses have moved to the ASP.NET. Now, you cannot predict how huge the future is going to be for the people experienced in the related technologies.
Hence, if you are looking for boosting up your profile and securing your future, ASP.NET will help you in reaching the zenith of your career. Apart from this, you would also have a lot of opportunities as a fresher.
These questions alone are omnipotent. Read and re-read the questions and their solutions to get accustomed to what you will be asked in the interview. These ASP.NET interview questions and answers will also help you on your way to mastering the skills and will take you to the giant world where worldwide and local businesses, huge or medium, are picking up the best and quality ASP.NET professionals.
This ultimate list of best ASP.NET interview questions will ride you through the quick knowledge of the subject and topics like Web Applications, Server Controls, Caching in ASP.NET. This ASP.NET interview questions and answers can be your next gateway to your next job as a ASP.NET expert.
These are very Basic ASP.NET Interview Questions and Answers for freshers and experienced both.
Q1: What is ASP.NET?
A1: ASP.NET was developed in direct response to the problems that developers had with classic ASP. Since ASP is in such wide use, however, Microsoft ensured that ASP scripts execute without modification on a machine with the .NET Framework (the ASP engine, ASP.DLL, is not modified when installing the .NET Framework). Thus, IIS can house both ASP and ASP.NET scripts on the same machine.
Advantages of ASP.NET
1. Separation of Code from HTML:
To make a clean sweep, with ASP.NET you have the ability to completely separate layout and business logic. This makes it much easier for teams of programmers and designers to collaborate efficiently.
2. Support for compiled languages:
Developer can use VB.NET and access features such as strong typing and object-oriented programming. Using compiled languages also means that ASP.NET pages do not suffer the performance penalties associated with interpreted code. ASP.NET pages are precompiled to byte-code and Just In Time (JIT) compiled when first requested. Subsequent requests are directed to the fully compiled code, which is cached until the source changes.
3. Use services provided by the .NET Framework:
The .NET Framework provides class libraries that can be used by your application. Some of the key classes help you with input/output, access to operating system services, data access, or even debugging. We will go into more detail on some of them in this module.
4. Graphical Development Environment:
Visual Studio .NET provides a very rich development environment for web developers. You can drag and drop controls and set properties the way you do in Visual Basic 6. And you have full IntelliSense support, not only for your code, but also for HTML and XML.
5. State management:
To refer to the problems mentioned before, ASP.NET provides solutions for session and application state management. State information can, for example, be kept in memory or stored in a database. It can be shared across web farms, and state information can be recovered, even if the server fails or the connection breaks down.
6. Update files while the server is running:
Components of your application can be updated while the server is online and clients are connected. The framework will use the new files as soon as they are copied to the application. Removed or old files that are still in use are kept in memory until the clients have finished.
7. XML-Based Configuration Files:
Configuration settings in ASP.NET are stored in XML files that you can easily read and edit. You can also easily copy these to another server, along with the other files that comprise your application.
Here are some points that give the quick overview of ASP.NET.
- ASP.NET provides services to allow the creation, deployment, and execution of Web Applications and Web Services.
- Like ASP, ASP.NET is a server-side technology.
- Web Applications are built using Web Forms. ASP.NET comes with built-in Web Forms controls, which are responsible for generating the user interface. They mirror typical HTML widgets like text boxes or buttons. If these controls do not fit your needs, you are free to create your own user controls.
- Web Forms are designed to make building web-based applications as easy as building Visual Basic applications.
Q2: What are the different validators in ASP.NET?
A2: ASP.NET validation controls define an important role in validating the user input data. Whenever the user gives the input, it must always be validated before sending it across to various layers of an application. If we get the user input with validation, then chances are that we are sending the wrong data. So, validation is a good idea to do whenever we are taking input from the user.
There are the following two types of validation in ASP.NET:
• Client-Side Validation
• Server-Side Validation
When validation occurs on the server, then it is known as Server-Side Validation. Server-Side Validation is a secure form of validation. The main advantage of Server-Side Validation is if the user somehow bypasses the Client-Side Validation, we can still catch the problem on server-side.
The following are the Validation Controls in ASP.NET:
• RequiredFieldValidator Control
• CompareValidator Control
• RangeValidator Control
• RegularExpressionValidator Control
• CustomFieldValidator Control
Q3: What is View State?
A3: View State is the method to preserve the Value of the Page and Controls between round trips. It is a Page-Level State Management technique. View State is turned on by default and normally serializes the data in every control on the page regardless of whether it is actually used during a post-back.
A web application is stateless. That means that a new instance of a page is created every time when we make a request to the server to get the page and after the round trip our page has been lost immediately
Features of View State
These are the main features of view state:
1. Retains the value of the Control after post-back without using a session.
2. Stores the value of Pages and Control Properties defined in the page.
3. Creates a custom View State Provider that lets you store View State Information in a SQL Server Database or in another data store.
Advantages of View State
1. Easy to Implement.
2. No server resources are required: The View State is contained in a structure within the page load.
3. Enhanced security features: It can be encoded and compressed or Unicode implementation.
Q4: What are Cookies in ASP.NET?
A4: Cookies are a State Management Technique that can store the values of control after a post-back. Cookies can store user-specific Information on the client’s machine like when the user last visited your site. Cookies are also known by many names, such as HTTP Cookies, Browser Cookies, Web Cookies, Session Cookies and so on. Basically cookies are a small text file sent by the web server and saved by the Web Browser on the client’s machine.
List of properties containing the HttpCookies Class:
1. Domain: Using these properties we can set the domain of the cookie.
2. Expires: This property sets the Expiration time of the cookies.
3. HasKeys: If the cookies have a subkey then it returns True.
4. Name: Contains the name of the Key.
5. Path: Contains the Virtual Path to be submitted with the Cookies.
6. Secured: If the cookies are to be passed in a secure connection then it only returns True.
7. Value: Contains the value of the cookies.
Limitation of the Cookies
1. The size of cookies is limited to 4096 bytes.
2. A total of 20 cookies can be used in a single website.
Q5: What is the concepts of Globalization and Localization in .NET?
A5: Localization means “process of translating resources for a specific culture”, and Globalization means “process of designing applications that can adapt to different cultures”.
• Proper Globalization: Your application should be able to Accept, Verify, and Display all global kind of data. It should well also be able to operate over this data, accordingly. We will discuss more about this “Accordingly operations over diff. culture data”.
• Localizability and Localization: Localizability stands for clearly separating the components of culture based operations regarding the user interface, and other operations from the executable code.
.NET framework has greatly simplified the task of creating the applications targeting the clients of multiple cultures. The namespaces involved in creation of globalize, localizing applications are:
Q6: What is the Web.config file in ASP?
A6: Configuration file is used to manage various settings that define a website. The settings are stored in XML files that are separate from your application code. In this way you can configure settings independently from your code. Generally a website contains a single Web.config file stored inside the application root directory. However there can be many configuration files that manage settings at various levels within an application.
Usage of configuration file
ASP.NET Configuration system is used to describe the properties and behaviors of various aspects of ASP.NET applications. Configuration files help you to manage the settings related to your website. Each file is an XML file (with the extension .config) that contains a set of configuration elements. Configuration information is stored in XML-based text files.
Benefits of XML-based Configuration files:
• ASP.NET Configuration system is extensible and application specific information can be stored and retrieved easily. It is human readable.
• You need not restart the web server when the settings are changed in configuration file. ASP.NET automatically detects the changes and applies them to the running ASP.NET application.
• You can use any standard text editor or XML parser to create and edit ASP.NET configuration files.
Q7: What’s the use of Response.Output.Write()?
A7: We can write formatted output using Response.Output.Write().
Q8: In which event of page cycle is the ViewState available?
A8: After the Init() and before the Page_Load().
Q9: What is the difference between Server.Transfer and Response.Redirect?
A9: In Server.Transfer page processing transfers from one page to the other page without making a round-trip back to the client’s browser. This provides a faster response with a little less overhead on the server. The clients url history list or current url Server does not update in case of Server.Transfer.
Response.Redirect is used to redirect the user’s browser to another page or site. It performs trip back to the client where the client’s browser is redirected to the new page. The user’s browser history list is updated to reflect the new address.
Q10: From which base class all Web Forms are inherited?
A10: Page class.
Q11: What are the different validators in ASP.NET?
1. Required field Validator
2. Range Validator
3. Compare Validator
4. Custom Validator
5. Regular expression Validator
6. Summary Validator
Q12: Which validator control you use if you need to make sure the values in two different controls matched?
A12: Compare Validator control.
Q13: What is ViewState?
A13: ViewState is used to retain the state of server-side objects between page post backs.
Q14: Where the viewstate is stored after the page postback?
A14: ViewState is stored in a hidden field on the page at client side. ViewState is transported to the client and back to the server, and is not stored on the server or any other external source.
Q15: How long the items in ViewState exists?
A15: They exist for the life of the current page.
Q16: What are the different Session state management options available in ASP.NET?
In-Process stores the session in memory on the web server.
Out-of-Process Session state management stores data in an external server. The external server may be either a SQL Server or a State Server. All objects stored in session are required to be serializable for Out-of-Process state management.
Q17: How do you secure your connection string information?
A17: By using the Protected Configuration feature.
Q18: How do you secure your configuration files to be accessed remotely by unauthorized users?
A18: ASP.NET configures IIS to deny access to any user that requests access to the Machine.config or Web.config files.
Q19: How can I configure ASP.NET applications that are running on a remote machine?
A19: You can use the Web Site Administration Tool to configure remote websites.
Q20: How many web.config files can I have in an application?
A20: You can keep multiple web.config files in an application. You can place a Web.config file inside a folder or wherever you need (apart from some exceptions) to override the configuration settings that are inherited from a configuration file located at a higher level in the hierarchy.
Q21: I have created a configuration setting in my web.config and have kept it at the root level. How do I prevent it from being overridden by another web.config that appears lower in the hierarchy?
A21: By setting the element’s Override attribute to false.
Q22: What is the difference between Response.Write and Response.Output.Write?
A22: As quoted by Scott Hanselman, the short answer is that the latter gives you String.Format-style output and the former doesn’t.
Q23: What is Cross Page Posting? How is it done?
A23: By default, ASP.NET submits a form to the same page. In cross-page posting, the form is submitted to a different page. This is done by setting the ‘PostBackUrl’ property of the button(that causes postback) to the desired page. In the code-behind of the page to which the form has been posted, use the ‘FindControl’method of the ‘PreviousPage’ property to reference the data of the control in the first page.
Q24: Can you change a Master Page dynamically at runtime? How?
A24: Yes. To change a master page, set the MasterPageFile property to point to the .master page during the PreInit page event.
Q25: What are Assemblies and Namespaces and explain the difference between them ?
A25: Namespaces are the containers for holding the classes. In Object Oriented world, it is possible that programmers will use the same class name. By using namespace along with class name this collision can be removed.
• An assembly exists as a .DLL or .EXE that contains MSIL code that is executed by CLR.
• An assembly contains interface and classes and it can also contain other resources like files, bitmaps etc.
Q26: Describe the Events in the Life Cycle of a Web Application ?
A26: A web application starts, when a browser requests a page of the application for the first time. The request will be received by the IIS which then starts ASP.NET worker process. The worker process then allocates a process space to the assembly and loads it. An Application_Start() event will fire on start of the application and it’s followed by Session_Start(). ASP.NET engine then processes the request and sends back response in the form of HTML to the user and user receives the response in the form of page.
Q27: Explain the Server Control Events of ASP.NET ?
A27: ASP.NET offers many server controls like Textbox, Button Dropdown List etc. Each control will respond to the user’s actions using events and event handler mechanism. Following are the Server Control Events:
• Postback events – These events sends the web page to the server for processing. Once processing is finished, web page will send data back to the same page on the server.
• Cached events – These events are processed when a postback event occurs.
Q28: What are Strong Names ?
A28: Strong names are unique names for assemblies. Strong name is similar as GUID in COM components. When we want to deploy the assembly in GAC, then we need to give the strong name for the assemblies. Strong name helps GAC to differentiate between two versions.
Q29: What is Reflection in .NET?
A29: Reflection is a mechanism through which types defined in the metadata of each module can be accessed. The System. Reflection namespace will have the classes required for reflection.
Q30: Define Resource Files?
A30: Resource files contains non-executable data like strings, images etc. that can be used by an application and deployed along with it. You can change these data without recompiling the whole application.
Q31: Differentiate between a page theme and a global theme?
A31: – Page theme applies to a particular web pages of the project. It is stored inside a subfolder of the App_Themes folder.
– Global theme applies to all the web applications on the web server. It is stored inside the Themes folder on a Web server.
Q32: What are Web server controls in ASP.NET?
A32: – These are the objects on ASP.NET pages that run when the Web page is requested.
– Some of these Web server controls, like button and text box, are similar to the HTML controls.
– Some controls exhibit complex behavior like the controls used to connect to data sources and display data.
Q33: Differentiate between a HyperLink control and a LinkButton control.
A33: – A HyperLink control does not have the Click and Command events while the LinkButton control has them, which can be handled in the code-behind file of the Web page.
Q34: How do Cookies work? Give an example of their abuse.
A34: – The server directs the browser to put some files in a cookie. All the cookies are then sent for the domain in each request.
– An example of cookie abuse could be a case where a large cookie is stored affecting the network traffic.
Q35: What are Custom User Controls in ASP.NET?
A35: – These are the controls defined by developers and work similar to other web server controls.
– They are a mixture of custom behavior and predefined behavior.
ASP.NET Conclusion Interview FAQs
We know the list of ASP.NET Interview Questions and Answers, ASP.NET Interview Questions and Answers Freshers, ASP.NET Interview Questions and Answers, ASP.NET Interview Questions is overwhelming but the advantages of reading all the questions will maximize your potential and help you crack the interview. The surprising fact is that this ASP.NET interview questions and answers post covers all the basic of the ASP.NET technology and you have to check out the FAQs of different components of ASP.NET too.
However, you will be asked with the questions in the interview related to the above mentioned questions. Preparing and understanding all the concept of ASP.NET technology will help you strengthen the other little information around the topic.
After preparing these interview questions, we recommend you to go for a mock interview before facing the real one. You can take the help of your friend or a ASP.NET expert to find the loop holes in your skills and knowledge. Moreover, this will also allow you in practicing and improving the communication skill which plays a vital role in getting placed and grabbing high salaries.
Remember, in the interview, the company or the business or you can say the examiner often checks your basic knowledge of the subject. If your basics is covered and strengthened, you can have the job of your dream. The industry experts understand that if the foundation of the student is already made up, it is easy for the company to educate the employ towards advance skills. If there are no basics, there is no meaning of having learnt the subject.
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We hope that you enjoyed reading ASP.NET Interview Questions and Answers, ASP.NET Interview Questions and Answers Freshers, ASP.NET Interview Questions and Answers, ASP.NET Interview Questions and all the FAQs associated with the interview. Do not forget to revise all the ASP.NET interview questions and answers before going for the ASP.NET interview. In addition to this, if you’ve any doubt or query associated with ASP.NET, you can contact us anytime. We will be happy to help you out at our earliest convenience. At last, we wish you all the best for your upcoming interview on ASP.NET Technology.