Top 20 Asp.net interview Question and answers
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This document contains 20 interview questions and answers related to .NET development. It covers topics like namespaces, debugging with and without a debugger, breakpoints, base classes for web forms, digital signatures, intermediate language, forms authentication sign out, disabling sessions, email sending classes, turning off cookies for one page, how .NET supports multiple languages, accessing HTTP information from classes, securing websites, garbage collection, state management, controls, the Global.asax file, differences between ExecuteQuery and ExecuteNonQuery, types of errors, and the root namespace.
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11. How is .NET able to support multiple languages?
Ans. A language should comply with the Common Language Runtime
(CLR) standard to become a .Net language. In .Net, code is compiled
to Microsoft Intermediate Language (MSIL). This is called as Managed
Code. This Managed code is run in .Net environment. So after
compilation to this IL the language is not a barrier. A code can call or
use a function written in another language.
12. How to access HTTP-Specific information from within
a class (.cs File)
Ans. Add reference to the System.Web assembly in your class and
use the Current property of the HttpContext object to access the
desired server variable. Like -
string value = (string)(HttpContext.Current.Session["someData"]);](https://image.slidesharecdn.com/asp-151117084518-lva1-app6892/85/Top-20-Asp-net-interview-Question-and-answers-7-320.jpg)
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17. What is the role of Global.asax file?
Ans. Stores Global information about the application.
18. What is the difference between ExecuteQuery() and
ExecuteNonQuery()?
Ans. ExecuteQuery : Executes SQL queries directly on the database.
It has two overlaoded method:
1. DataContext.ExecuteQuery(TResult)(String, Object[]) - Executes
SQL queries directly on the database and returns objects.
2. ExecuteQuery(Type, String, object[]) - Executes SQL queries
directly on the database.
ExecuteNonQuery : Use for data manipulation, such as Insert,
Update, Delete.](https://image.slidesharecdn.com/asp-151117084518-lva1-app6892/85/Top-20-Asp-net-interview-Question-and-answers-10-320.jpg)
Top 20 Asp.net interview Question and answers
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- 2. www.w3asp.net 1. What are namespaces, and how they are used? Ans. Namespaces are used to organize classes within the .NET Framework. They dictate the logical structure of the code. The .NET Framework has namespaces defined for its many classes, such as System.Xmlâthese are utilized via the using statement. Namespaces are assigned to classes via the namespace keyword. 2. How can I run an application with and without debugger? Ans. To run the application with debugger, select Debug > Run or press F5. To run the application without debugger, select Debug > Run without debugger or press Ctrl+F5
- 3. www.w3asp.net 3. What are break points in context with the debugger? Ans. A break point is the line of code at which you want your program to be paused (when running in debugger mode) and see the runtime values of different variables in the program. If the program control ever reaches this line during the execution of the program, it pause the execution and allows you to see and edit the values of the variables of your program. 4. What base class do all Web Forms inherit from ? Ans. System.Windows.Forms.Form
- 4. www.w3asp.net 5. What is a digital signature? Ans. A digital signature is an electronic signature used to verify/guarantee the identity of the individual who is sending the message. 6. What is a IL? Ans. (IL)Intermediate Language is also known as MSIL (Microsoft Intermediate Language) or CIL (Common Intermediate Language). All .NET source code is compiled to IL. This IL is then converted to machine code at the point where the software is installed, or at run- time by a Just-In- Time (JIT) compiler.
- 5. www.w3asp.net 7. How do I sign out in forms authentication? Ans. FormsAuthentication.Signout () 8. How you can disable session in Asp.net? Ans. If we set session Mode=âoffâ in web.config file, session will be disabled in the application. For this we need to configure web.config in the following way: <Configuration> <sessionmode="off"/> </configuration>
- 6. www.w3asp.net 9. What classes are needed to send e-mail from an ASP.NET application? Ans. The classes MailMessage and SmtpMail have to be used to send email from an ASP.NET application. MailMessage and SmtpMail are classes defined in the .NET Framework Class Library(s) System.Web.Mail namespace. 10. How do you turn off cookies for one page in your site? Ans. Use the Cookie.Discard Property which Gets or Sets the discard flag set by the server. When true, this property instructs the client application not to save the Cookie on the hard disk when a session ends.
- 7. www.w3asp.net 11. How is .NET able to support multiple languages? Ans. A language should comply with the Common Language Runtime (CLR) standard to become a .Net language. In .Net, code is compiled to Microsoft Intermediate Language (MSIL). This is called as Managed Code. This Managed code is run in .Net environment. So after compilation to this IL the language is not a barrier. A code can call or use a function written in another language. 12. How to access HTTP-Specific information from within a class (.cs File) Ans. Add reference to the System.Web assembly in your class and use the Current property of the HttpContext object to access the desired server variable. Like - string value = (string)(HttpContext.Current.Session["someData"]);
- 8. www.w3asp.net 13. What are the various ways of securing a web site that could prevent from unwanted uses? Ans. 1 Authentication/Authorization 2 Encryption/Decryption 3 Maintaining web servers outside the corporate firewall. 14. What is the Garbage Collection in ASP.Net ? Ans. GC is the process whereby the Common Language Runtime (CLR) reclaims memory that is no longer in useâi.e., no longer referenced by an active object. Objects on the heap are garbage collected after the final reference to them is destroyed. The exact moment of collection is determined by the CLR. Memory for stack values is freed up immediately when the stack frame in which they are declared endsâe.g., when a method returns.
- 9. www.w3asp.net 15. What is the state management? What is the use of state management in ASP.Net ? Ans. State management is nothing but maintaining the user information on client side or sever side. There are two types of state management - 1. Server side state management - Session, Application, Caching, Profiles. 2. Client side state management - Query string, Hidden field, Cookies, Viewstates. 16. What is a control? Ans. A control is a component that provides user-interface (UI) capabilities.
- 10. www.w3asp.net 17. What is the role of Global.asax file? Ans. Stores Global information about the application. 18. What is the difference between ExecuteQuery() and ExecuteNonQuery()? Ans. ExecuteQuery : Executes SQL queries directly on the database. It has two overlaoded method: 1. DataContext.ExecuteQuery(TResult)(String, Object[]) - Executes SQL queries directly on the database and returns objects. 2. ExecuteQuery(Type, String, object[]) - Executes SQL queries directly on the database. ExecuteNonQuery : Use for data manipulation, such as Insert, Update, Delete.
- 11. www.w3asp.net 19.Explain the types of errors. Ans. Syntax Errors: These include misspelled or missing keywords, or other mistakes relating to the syntax of the language. Runtime Errors: These errors are caused by the code that appears correct to the compiler, but that cannot run with certain values Logic Errors: These are errors in which a program that works correctly under some circumstances give unexpected or unwanted results based on certain input. 20. What is the root namespace for all types? Ans. System.
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