A C# Class Considered being the primary building block of the language. What I mean by the primary building block of the language is that every time you work with C# you will create Classes to form a program. We use Classes as a template to put the properties and functionalities or behaviors in one building block for some group of objects and after that we use that template to create the objects we need.

A class can contain declarations of the following members:

Constructors, Destructors, Constants, Fields, Methods, Properties,Indexers, Operators, Events, Delegates, Classes, Interfaces, Structs



An interface contains only the signatures of methods, delegates or events. The implementation of the methods is done in the class that implements the interface. A class that implements an interface can explicitly implement members of that interface. An explicitly implemented member cannot be accessed through a class instance, but only through an instance of the interface.

An interface can inherit from one or more base interfaces. When a base type list contains a base class and interfaces, the base class must come first in the list.

interface ISampleInterface
{
    void SampleMethod();
}

class ImplementationClass : ISampleInterface
{
    // Explicit interface member implementation: 
    void ISampleInterface.SampleMethod()
    {
        // Method implementation.
    }

    static void Main()
    {
        // Declare an interface instance.
        ISampleInterface obj = new ImplementationClass();

        // Call the member.
        obj.SampleMethod();
    }
}

Can U cite a simple example for it?

we can also use like this......

ImplementationClass obj = new ImplementationClass
(); // Call the member. ((ISampleInterface)obj).SampleMethod();

vc

If you can provide Examples, with real time examples. Its is much more easer to understand...
Thank you!!!!

if u want to understand abt it thn its really usefull n also 4 understand d example
thnx a lot....!!!!

what is main benefit of the interface???

the main benefit of the INTERFACE is enabling multiple INHERITANCE IN c Sharp and mostly used in EVENT DRIVEN PROGRAMMING

these all the answers are theoretical
Can u tell me difference between IDatareader and Datareader

thank you

C# does not support the Multiple Inheritance(Using in C++).To Implement the multiple inheritance concept in C# and Java we use the interface.Interface always declared with public Keyword.
we can not create the object of interface but we can create the virtual object of interface.
In interface we can only declare the method/function but not define here.we must define it in that class who inherit the interface. for examples

public interface A
{
void show();
}
public interface B
{
void disp();
}
class C:A,B
{
public void show()
{

}
public void disp()
{
}
}
class test
{
public static void Main()
{
C c1=new C();
c1.show();
c2.disp();
A a1=c1;//Virtual Object
Console.ReadLine();
}
}

Hi rajesh...r other frndz:-)

kindly let me knw the use of creating virtual objects for interface??? will be needy...

anyone else are welcome too... plz..

so objects of interface can be made in c# unlike in java?? I thought in java, interface objects cannot be made because they dont have a constructor. That virtual object thing is what i dont get.

An interface contains only the signatures of methods, delegates or events. The implementation of the methods is done in the class that implements the interface. A class that implements an interface can explicitly implement members of that interface. An explicitly implemented member cannot be accessed through a class instance, but only through an instance of the interface.

An interface can inherit from one or more base interfaces. When a base type list contains a base class and interfaces, the base class must come first in the list.

OOPs Concepts

What is Abstraction

What is Encapsulation

What is Inheritance

Polymorphism in .Net

Difference between Abstraction and Encapsulation

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