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C# Technical Query!

August 8, 2019 - 10:56pm #1

Hi All, I am a little bit nervous about facing my upcoming interviews. I have good knowledge about C# programming and I needs to realize which kinds of most recent inquiry will pose by questioner. This is my first experience to pose my inquiry in gathering. One of my companion was proposed me to put our question in this gathering. So on the off chance that anybody know the a few hints and some rule, it will causes me.

C# Technical Query!

August 20, 2019 - 10:05pm #2

Arjunkumar wrote:

Hi All, I am a little bit nervous about facing my upcoming interviews. I have good knowledge about C# programming and I needs to realize which kinds of most recent inquiry will pose by questioner. This is my first experience to pose my inquiry in gathering. One of my companion was proposed me to put our question in this gathering. So on the off chance that anybody know the a few hints and some rule, it will causes me.

Hi Arjun,

I want to give my honest opinion, As you know that this is not the semester exam where you need to write answer, here you need to represent your self in-front of the senior developer how efficient you are in the particular technology where you will add some value on the growth of company as well as for product, So this is going to be bigger experience. So never ever ever think about the question, only think about deploying some projects. Creating a new projects always gives us a new learning through we can learn more and more.

Still I am listing a few question list which is frequently asked in C# Interview Questions:

1. What is C#?

C# is an object oriented, type safe and managed language that is compiled by .Net framework to generate Microsoft Intermediate Language.

2. What are the types of comment in C# with examples?

Single line

Eg:

//This is a Single line comment

ii. Multiple line (/* */)

Eg:

/*This is a multiple line comment

We are in line 2

Last line of comment*/

iii. XML Comments (///).

Eg:

/// summary;

///  Set error message for multilingual language.

/// summary

3. Can multiple catch blocks be executed?

No, Multiple catch blocks can't be executed. Once the proper catch code executed, the control is transferred to the finally block and then the code that follows the finally block gets executed.

4. What is the difference between public, static and void?

Public declared variables or methods are accessible anywhere in the application. Static declared variables or methods are globally accessible without creating an instance of the class. Static member are by default not globally accessible it depends upon the type of access modified used. The compiler stores the address of the method as the entry point and uses this information to begin execution before any objects are created. And Void is a type modifier that states that the method or variable does not return any value.

5. What is an object?

An object is an instance of a class through which we access the methods of that class. "New" keyword is used to create an object. A class that creates an object in memory will contain the information about the methods, variables and behavior of that class.

6. Define Constructors?

A constructor is a member function in a class that has the same name as its class. The constructor is automatically invoked whenever an object class is created. It constructs the values of data members while initializing the class.

7. What is Jagged Arrays?

The array which has elements of type array is called jagged array. The elements can be of different dimensions and sizes. We can also call jagged array as Array of arrays.

8. What is the difference between ref & out parameters?

An argument passed as ref must be initialized before passing to the method whereas out parameter needs not to be initialized before passing to a method.

9. What is the use of using statement in C#?

The using block is used to obtain a resource and use it and then automatically dispose of when the execution of block completed.

10. What is serialization?

When we want to transport an object through network then we have to convert the object into a stream of bytes. The process of converting an object into a stream of bytes is called Serialization. For an object to be serializable, it should implement ISerialize Interface. De-serialization is the reverse process of creating an object from a stream of bytes.

11. Can "this" be used within a static method?

We can't use 'This' in a static method because we can only use static variables/methods in a static method.

12. What is difference between constants and read-only?

Constant variables are declared and initialized at compile time. The value can't be changed afterwards. Read only is used only when we want to assign the value at run time.

13. What is an interface class?

Interface is an abstract class which has only public abstract methods and the methods only have the declaration and not the definition. These abstract methods must be implemented in the inherited classes.

14. What are value types and reference types?

Value types are stored in the Stack whereas reference types stored on heap.Value types:

int, enum , byte, decimal, double, float, long

Reference Types:

string , class, interface, object

15. What are Custom Control and User Control?

Custom Controls are controls generated as compiled code (Dlls), those are easier to use and can be added to toolbox. Developers can drag and drop controls to their web forms. Attributes can be set at design time. We can easily add custom controls to Multiple Applications (If Shared Dlls), If they are private then we can copy to dll to bin directory of web application and then add reference and can use them.User Controls are very much similar to ASP include files, and are easy to create. User controls can't be placed in the toolbox and dragged - dropped from it. They have their design and code behind. The file extension for user controls is ascx.

16. What are sealed classes in C#?

We create sealed classes when we want to restrict the class to be inherited. Sealed modifier used to prevent derivation from a class. If we forcefully specify a sealed class as base class then a compile-time error occurs.

17. What is method overloading?

Method overloading is creating multiple methods with the same name with unique signatures in the same class. When we compile, the compiler uses overload resolution to determine the specific method to be invoke.

18. What is the difference between Array and Arraylist?

In an array, we can have items of the same type only. The size of the array is fixed. An arraylist is similar to an array but it doesn't have a fixed size.

19. Can a private virtual method be overridden?

No, because they are not accessible outside the class.

20. Describe the accessibility modifier "protected internal".

Protected Internal variables/methods are accessible within the same assembly and also from the classes that are derived from this parent class.

Click Here for more C# interview Questions.

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