(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...

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how to find out second maximum number in C#?

Roger Hyde

• Feb 6th, 2016

Linq makes this quite simple

Code
 

Vasyliy Zvarydchuk

 Profile Answers by Vasyliy Zvarydchuk Questions by Vasyliy Zvarydchuk

• Oct 28th, 2015

This code will work even if array will have a few maximums. Ex: (10, 8, 8, -2, 4, 10, 1) "c# static int GetSecondMax(int[] array) { if(array.Length < 2...

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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) { ...

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Dnayenshwar

• Aug 1st, 2016

Yes, We can handle the exceptions without using Try catch block.
We can use global.asax event i.e Application_Error .

nitesh

• Mar 31st, 2016

Yes..It is possible using if else statements in your code

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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...

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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...

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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.

Improve Answer

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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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

nikhilrawat23

 Profile Answers by nikhilrawat23 Questions by nikhilrawat23

• May 27th, 2008

False in c#

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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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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 debug C# Web Application?

Samwise Galenorn

• Nov 26th, 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

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Skill/Topic: BeginnerA) objThis = System.CreateObject( ThisObject);B) objThis = new ThisObject();

Naveen kumar

• Mar 3rd, 2017

B)objThis=new ThisObject();

sahu

 Profile Answers by sahu Questions by sahu

• Dec 10th, 2005

Ans:B) objThis = new ThisObject();

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What is extension of file? What is WCF Webservice? How to call Webservice? How to call method of WebService? What is rest WebServices?

arumugakumar.s

• Apr 6th, 2017

.asmx

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How does a CLR work?

Arumugakumar.S

• Apr 6th, 2017

CLR is the heart of .NET Framework. It converts the IL code Machine Code.

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Arumugakumar.S

• Apr 6th, 2017

.NET 4.6 added two new methods: GC.TryStartNoGCRegion and GC.EndNoGCRegion just for this.

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Yes, but they are not accessible, so looking at it you can honestly say that they are not inherited. But they are.

Rajendra Mahakali

• Jun 29th, 2017

YES, But they are accessible. Although they are not visible or accessible, but YES they are inherited.

kodefuguru

 Profile Answers by kodefuguru Questions by kodefuguru

• Aug 12th, 2010

All members are inherited from the base class except for instance and static constructors and destructors. Inherited private members are inaccessible unless the subclass is nested in the base class.

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Two. Once you write at least one constructor, C# cancels the freebie constructor, and now you have to write one yourself, even if there's no implementation in it.

sgaron

• Oct 26th, 2017

One constructor is enough. In every constructor program we can't create number of constructor. We can create the number of classes in constructor. so here we can give parameters in method only we can declare the parameters.

PavanKumar

• Nov 19th, 2006

Hi,In C#.Net we can have multiple constructors.Before going any further I think you need to know a liitle bit about the constructors. ...

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Abhijeet Gawali

• Apr 20th, 2018

Yes, if u Create Abstract class one or more abstract method in class. If after inherit Abstract Class all abstract methods are compulsory/Mandatory implemented in derived class., otherwise they gene...

navneetgoyal2000

 Profile Answers by navneetgoyal2000 Questions by navneetgoyal2000

• Jan 6th, 2011

NOEven you need not to implement ALL of the PURE VIRTUAL FUNCTIONS of Abstract Class, in Derived Class.But then, the Derived class too will be an Abstract Class.Now Question Arises:What is the Use of ...

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

Sujit

• Feb 18th, 2019

Keep on subtracting divisor from dividend until dividend is 0 and return the count as quotient.

Pushpa Sundar

• Mar 16th, 2018

"java import java.util.Scanner; public class Divition { public static void main(String[] args) { Scanner scn=new Scanner(System.in); System.out.println("Enter the Divi...

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Sujit

• Feb 18th, 2019

Nope. We cant inherit a class if it has Private constructor.

Vikas Kumar Bhatnagar

• Aug 14th, 2018

We cant inherit the abstract class and when we declared a class as abstract and define the private constructor .
Following compilation error:
Cannot create an instance of the abstract class or interface Singleton.
Singleton.Singleton() is inaccessible due to its protection level

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