C# Interview Questions

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    Debug C# Web Application

    How to debug C# Web Application?

    Samwise Galenorn

    • Nov 25th, 2016

    To debug C# Web App, you need Visual Studio, and a local IIS Server 6.0 or above. First, load the code into Visual Studio, next fire up the worker process by invoking the web app. Once the worker proc...

    Cris

    • Mar 3rd, 2016

    Use Firebug for Firefox

  •  

    Advantage of avl tree over binary search tree.

    What is advantage using avl tree instead of using binary search tree ?

    simran

    • Nov 23rd, 2016

    In BST, the time complexity of search operation (average case) is taken to be O(log n). But in the worst case, i.e the degenerate trees/skewed trees time complexity of search operation is O(n) which c...

    kirubasri

    • Sep 8th, 2015

    Better search times for keys

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    How to upload a file in c# console application

    sandya Kolipaka

    • Nov 10th, 2016

    Static void Main(string[] args)
    {
    var wc = new WebClient();
    byte[] response = wc.UploadFile("http:// mysite . com/Tests/Test", "POST", "teste.xml");
    string s = System.Text.Encoding.ASCII.GetString(response);
    Console.WriteLine(s);
    Console.ReadKey();
    }

    vishal

    • Feb 15th, 2007

    Use System.Net.WebClient Class use UploadFile method provided by the class. It accepts the Uri or string as destination and another parameter as location of file to be uploaded.

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    Divide Two Numbers Without Using Division and Modulus Operator

    Write C# code to divide two numbers without using the division and modulus operator

    Samwise Galenorn

    • Oct 27th, 2016

    Use the laws of logs"c# private double divideWO(double dividend, double divisor) { double sign = (dividend * divisor < 0) ? -1.0 : 1.0; double quotient; if (divid...

    Thirunavukkarasu G

    • Sep 15th, 2016

    "c# using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Quotient_and_Remainder { class Progra...

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    Only a 'Static' method can be called using delegate - True / False? Give Reason

    Naveen Shivanadri

    • Sep 18th, 2016

    Using delegate, we can execute static method as well as instance method. By binding a method with delegate, we will use the instance if the method is instance method else method name if the method is static.

    Naveen

  •  

    Multicast Delegate

    What is multicast delegate? When it is used?

    Naveen Shivanadri

    • Sep 18th, 2016

    Multicast delegate is useful when the application has many methods (each method for each purpose) which are no return type (void) and those methods are using same parameter. In this case we will use ...

    Reeshabh Choudhary

    • Nov 4th, 2015

    A useful property of delegate objects is that multiple objects can be assigned to one delegate instance by using the + operator. The multicast delegate contains a list of the assigned delegates. When...

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    How do I create a Delegate/MulticastDelegate?

    C# requires only a single parameter for delegates: the method address. Unlike other languages, where the programmer must specify an object reference and the method to invoke, C# can infer both pieces of information by just specifying the method's name. For example, let's use System.Threading.ThreadStart: Foo MyFoo = new Foo();ThreadStart del = new ThreadStart(MyFoo.Baz);This means that delegates can...

    Star Read Best Answer

    Editorial / Best Answer

    Answered by: Raghu

    • Sep 29th, 2005


    This article is good.

    Introduction


    In this article I am going to share my knowledge on Delegates in C#.This would explain the Delegate using simple examples so that the beginner can understand the same.


    What is Delegate?


    Definition:

    Delegate is type which  holds the method(s) reference in an object.
    it is also reffered as a type safe function pointers.

    Advantages:
    .Encapsulating the method's call from caller
    .Effective use of Delegat improves the performance of application.
    .used to call a method asynchronously.

    Declaration:

    public delegate type_of_delegate delegate_name()

    Example : public delegate int mydelegate(int delvar1,int delvar2)

    Note:
    .you can use delegeate without parameter or with parameter list
    .you should follow the same syntax as in the method
    (if you are reffering the method with two int parameters and int return type the delegate which you are declaring should be the same format.This is how it
    is reffered as type safe function pointer)

    Sample Program using Delegate :

    public delegate double Delegate_Prod(int a,int b);

    class Class1
    {


    static double fn_Prodvalues(int val1,int val2)
      {
    return val1*val2;
      }
    static void Main(string[] args)
    {


    //Creating the Delegate Instance
    Delegate_Prod delObj = new Delegate_Prod(fn_Prodvalues);


    Console.Write("Please Enter Values");

    int v1 = Int32.Parse(Console.ReadLine());
    int v2 = Int32.Parse(Console.ReadLine());

    //use a delegate for processing

    double res = delObj(v1,v2);
    Console.WriteLine ("Result :"+res);
    Console.ReadLine();

    }
    }


    Explanation:

    Here I have used a small program which demonstrates the use of delegate.

    The delegate "Delegate_Prod" is declared with double return type and which accepts only two integer parameters.

    Inside the Class the method named fn_Prodvalues is defined with double return type and two integer parameters.(The delegate and method is having the same signature and parameters type)

    Inside the Main method the delegate instance is created and the function name is passed to the
    delegate instance as following.

    Delegate_Prod delObj = new Delegate_Prod(fn_Prodvalues);

    After this we are accepting the two values from the user and passing those values to the delegate as we do using method .

    delObj(v1,v2);

    Here  delegate object encapsulates the method functionalities and return the result as we specified
    in the method.


    Multicast Delegate


    What is Multicast Delegate? :
    It is a Delegate which holds the reference of more than one methods.
    Multicast delegates must contain only methods that return void, else there is a run-time exception.

    Simple Program using Multicast Delegate
    ----------------------------------------

    delegate void Delegate_Multicast(int x, int y);

    Class Class2

    {
    static void Method1(int x, int y) {
     Console.WriteLine("You r in Method 1");
    }
    static void Method2(int x, int y) {
     Console.WriteLine("You r in Method 2");
    }
    public static void Main()
    {
     Delegate_Multicast func = new Delegate_Multicast(Method1);

     func += new Delegate_Multicast(Method2);
     func(1,2);             // Method1 and Method2 are called
     func -= new Delegate_Multicast(Method1);
     func(2,3);             // Only Method2 is called
    }

    }
                               

    Explanation:

    In the above example you can see that two methods are defined named method1 and method2 which takes two integer parameters and return type as void.

    In the main method the Delegate object is created using the following statement


    Delegate_Multicast func = new Delegate_Multicast(Method1);

    Then the Delegate is added using the += operator and removed using -= operator.



    Naveen Kumar Shivanadri

    • Sep 8th, 2016

    Delegate is not type. It is just pointer method which is used to improve the performance. Suppose we want to execute a method 10 times by using calling method by using class name or instance, 10 time...

    Rajesh Muurya

    • Aug 9th, 2016

    I have some doubt.
    Raghus Says: Delegate is type which holds the method(s) reference in an object.
    My question is if Delegate is type then how we create a object of delegate? Because, we know that we can create object only struct and class.

  •  

    Is it possible to inherit a class that has only private constructor?

    Naveen Kumar Shivanadri

    • Sep 8th, 2016

    The direct answer for this question is "No". Before discussing this topic, there is necessary to know one thing All the variables are initialized with the help constructor. It means, if the varia...

  •  

    How do you make a class not instantiable

    A) Making class as AbstractB) Having a Private constructorC) Making the class sealedD) Both A & B

    Naveen Kumar Shivanadri

    • Sep 8th, 2016

    Answer is A is always correct and B is also correct only the situation when the class does not have the static methods on it (in the question, there is no mentioned that there is no static method in it)
    So, only A is correct answer.

    Naveen Kumar Shivanadr.

    ramya

    • Oct 13th, 2015

    Making class as Abstract

  •  

    What is the difference between an interface and abstract class?

    In the interface all methods must be abstract; in the abstract class some methods can be concrete. In the interface no accessibility modifiers are allowed, which is ok in abstract classes.

    Naveen Kumar Shivanadri

    • Sep 8th, 2016

    The basic difference is Abstract class can contain abstract methods (a method without method body) as well as concrete methods (a method with method body). Where as in the interface there is only f...

    Ramprit Sahani

    • Sep 1st, 2016

    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 clas...

  •  

    Find subString in String

    Hi All,
    I have written the below program to find the substring in the string. in case one word coming multiple time how to handle this situation ? the below program retuning -1 as position which is wrong.

    cInput ("abhijit" , "jit")
    public int FindSubString(string strSuper, string strSub)
    {
    char[] charSuper = strSuper.ToCharArray();
    ...

    Annon

    • Jun 15th, 2016

    This answer is wrong. Ex:

    substr("abcabcabcd", "abcabcd")

    => false (should return true)

    Danthe74

    • Dec 14th, 2014

    My solution require only one while loop. Function returns the position of find chars."c# public static int FindSubString(string strSuper, string strSub) { ...

  •  

    Second maximum number

    how to find out second maximum number in C#?

    Roger Hyde

    • Feb 6th, 2016

    Linq makes this quite simple

    Code
    1. int GetSecondMax(int[] numbers)
    2. {
    3.         return numbers.Distinct().OrderByDescending(n => n).Skip(1).Take(1).FirstOrDefault();
    4. }

  •  

    Why multiple Inheritance is not possible in C#?

    (Please do not answer like this-It is possible through Interfaces.)

    Anujan

    • Dec 30th, 2015

    I think that ambiguity can be easily overridden by using the class name as a prefix before the method. The same as we do as in case we want to implement a method with the same name as in the case of i...

    Riki

    • Sep 1st, 2015

    C# does not allow multiple inheritance because of ambiguity. Say class A has a property "name" which is inherited by class X and Y now we have another class B which is inheriting both X and Y. Here is...

  •  

    Object Oriented and Object Based Language

    Explain What are Object Oriented Language and Object Based Language

    Star Read Best Answer

    Editorial / Best Answer

    Aarthy_SP  

    • Member Since Dec-2008 | Dec 10th, 2008


    Any langauge based on encapsulation concpet and operations with the objects are called as Object Based language. Exmaple : VB is a Object based and not an Object oriented

    Any langauge based on encapsulation concept and operations with the objects and also dealing with the inheritance and polymorphism are called as Object Oriented language. Exmaple : C++,C#

    Arpit Mandloi

    • Nov 25th, 2015

    Object Based languages: 1. Object-based language doesn't support all the features of OOPs like Polymorphism and Inheritance 2. Object-based language has in-built object like JavaScript has window obje...

  •  

    Define reflection

    What is reflection and assembly?

    Poornima

    • Sep 12th, 2012

    Fetching the assembly information at runtime

  •  

    Why strings are immutable?

    Jeevan

    • Apr 20th, 2012

    People, please read the question before answering, don't just answer "Why" is the question - not "how".

  •  

    What is the difference between serialization and encoding?

    Vasyliy Zvarydchuk

    • Sep 5th, 2015

    Encoding is a process of representation some information is optimal format for storing or transmission data. And serialization is representation some object or objects for transmission data between so...

    Hardev Gangwar

    • Jun 3rd, 2015

    1- All three transform data into another format. 2- Both encoding and encryption are reversible. 3- encoding use Algorithm to encode and de-code the data. 4- encryption use Algorithm and key to encryp...

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