Interview Question

  In this site i have Posted lot of interview Question that  I have faced when  attended a interview in Various companies

1. Difference between Abstract class And Interface?

2. Difference between Abstract Method And Virtual Method?

3. Different way that Method should return multiple Outputs?
    Answer  from My side
        class that contain return values.
        Tuple
        Out
         ref
        Dynamic

4 Difference Between Ref And Out KeyWord?

5. What Is Boxing And UnBoxing? Give live example on Boxing and boxing in your Web Application?
Boxing -Conversion of value type to reference type.
Unboxing -Convertion of reference type to value type.
In mvc
ViewData["Propery"] = intvalue;   Require Type Casting


6. What is Session State? Where it get saved in Your Computer? or where it get stored?
 Answer is
   in Proc  (in server memory)
  StateServer (Managed by aspnep_state.exe)
  SQLServer(sql server)
  Custom
  Off

7. What is the difference between Prerender And Render in Page life Cycle?

8. What is tedious page event in asp.net Page life  cycle?

9, What is Singleton design Pattern? where it is used?

10. what is the difference between Post increment and pre increment?
  Post Increment Add 1 to the value an return old Value
   Example : int  test = 1;
              int   bb = test++;
  Now the above value test  contains 2  and bb contains 1

Pre increment  adds 1 and return the new value
 Example : int  test = 1;
                 int   bb = ++ test;
                 value of test and bb is 2

11. Difference between Array And ArrayList?

12. What is Garbage collector? what are its generations?

13.  Difference between   string == string  and string.Equal(string)
     For example   string aa= "Apple"  string bb= "Apple"
            aa== bb ,  aa.Equals(bb)?

14 Is it possible to place more than one .web config file in Asp.net project?

15. What is WCF Service?

16 .What are the different type of contract in WCF Service?
      DataContract,
      Operation Contract,
      Service Contract
      Message contract and
      Fault Contract

17 if there is an error in consuming wcf service for example division by error how you throw to the end user?
   Answer is Fault contract

18 What is a Linq? What is is advantages?

19. Difference between IQueriable<> and IEnumerable<>?
IEnumerable -in memory filter  example : list.Take<custome>(10);    -- in sql  profiler  the Query executed is Select customerID,CustomerName from Customer

IQueriable -executed selected query on client side and server side   example : list.Take<customer>(10);    -- in sql  profiler  the Query executed is Select  TOP 10 customerID,CustomerName from Customer

 20 What is he difference between Custom Control And User control in Asp.net?

21. Where we use Strong Naming?
Strong naming is used to give unique identity to assemblies like name, version number, and culture information   (if provided)—provides a public key and a digital signature.  strong naming Assemblies are identical. it solve dll problem in GAC

 Technical Round
22. Write a chat Application Logic?

23.  Why Repository Design Pattern ?What is the Advantage of using Repository Pattern?

24. Difference between MVC And Asp.net ? What is Its Advantages?

25. What is Difference between  View Data, View Bag And Temp Data?
  Answer is
       ViewData And ViewBag both used to communicate with its corresponding View.
       ViewData["Propery"] =object;   Require Type Casting

      ViewBag.prop1 =property1;
        ViewBag.prop2 =property2;   Require no type Casting
 
       TempData used to transfer data from controller to controller if redirection Happens.

26. In MVC  our URL look  Like  -  HTTP//localhost/ Controller/Action/Parameters.   is it possible to change like  HTTP://localhost/Action/Controller/Parameters?  How can you implement this?

27. Different Type of hosting in WCF?
           Hosting in  Internet Information Services(IIS),
           Hosting in  Windows Activation Services(WAS),
           Hosting in  a Console or Desktop application(Self hosting),
           Hosting in  a Windows Service.

28. What is the difference between WebSite And Web Application?

29. What is serialization in .net? Different type of serialization  in Asp.net?

30 Difference between EDMX file And DBML File?

31 Why we need Partial Classes?

32.  Why we need webApi?

33 what is the Diference between WCF And WEBAPI?

33 what is the difference between HTTPGET & HTTPPOST?
       Http-Get
         get datas from the serve
        only getting data from the sver hense postback(reload,refresh) will not affect
        data can be cached
        data is visible in url - secuity is less

Http-Post
    Update Data in the server - postback affect the data so end user ge warning when postback(reload,refresh) happend,
    no caching
    data not visible in the url - security is high

34 Can you tell us any three Performance tuning in SQL Server?

34 Can you tell  how you implement performance tuning in your current web Application?

35  Please tell me which catch block executes from the below statement

        try
            {
                int number1 = 3000;
                int number2 = 0;
                int result = number1 / number2;
                /// Here division Error Occurs
            }
            catch (Exception ex)
            {
                throw ex;
            }
            catch (SqlException sqex)
            {
                throw sqex;
            }
            catch (DivideByZeroException dex)
            {
                throw dex;
            }

        i f you try to run the above code it throws error...
        interviewer wants to know why the error  occurs or they want to know which code blocks executes?

The answer to the Question is   First Catch Block  -  Exception is the super type or base class for all other exception given above