Abstract Class

Good one .. :)

Nice article for the beginers

I think this is good for new learners.

Hey,
The statement in the last point 'An Abstract Class can only contain Abstract Method is ambiguous.'
What I say is ,
An abstract class can have a Normal method as well as an abstract methods.
That means If any one method inside a class is abstract the WHOLE CLASS has to be abstract but not vice versa.

Thnx Kishork80.

Nice Article!

Can you post similarly for Interface, Encapsulation and Abstraction with examples? it will be really helpful.

Yes, Karthikanbarasan I have posted a similar article on Interface today. Rest i shall cover asap. Plz keep on suggesting me in this way. Many Thnx!

Ganesh ji..

Thanks for Submitting very good articles..
I have got few quick Q ..

can we have seald methods in Abstract Class ?
can we have Virtual methods in Abstract Class ?

Thanks.

Nice Ganeshji.... Its really helpful... Keep going....

Hi
Good article. But when and where should you user abstract classes and what is the use of abstract classes?
thanks
bcs

@Karthikanbarasan

We can not have 'Sealed' type because sealed contradicts the purpose of 'Abstract'. On the other side we can haev virtual because it can be overriden in the implemeting class.

See the code below.
abstract class TTest
{
public virtual void T1()
{ }
//ERROR:'ConsoleApplication2.TTest.T2()' cannot be sealed because it is not an override
public sealed void T2()
{ }
}

@ KishorK80..

Thanks kishor..

But i think we need to check the below line of code.

using System;
class Program
{
static void Main(string[] args)
{ C c1 = new C();
c1.Hello();

}

}
class A
{
public virtual void Hello()
{
Console.WriteLine(" Say Hello");
}

}

abstract class B : A
{
public sealed override void Hello()
{
Console.WriteLine(" Say Hi");
}

}

class C : B
{
}


//Output is
// Say Hi
//Press any key to continue . . .


Here I was able to declare Sealed Method in Class B which is an abstract class.

Thanks,

@Bcs2002

Abstract class can be used in order to create the looseley coupled environment.

We can put all common set of functionality & Behaviour in the abstact class..
& then we can derive the abstract class implementing abstract methods..

Thanks,

Very good explanation......
just can you tell me what is the sole purpose of an abstract class ?

Thanks and Regards
Akiii

Yes Akii! Very Good Question u have. If anyone wishes to make use of a particular function signature, then abstract class can be ideally used.

nice and simple article thanks

can u also plz define interface

Thanks Kamlesh. I have an article on interface in the following link.http://www.dotnetfunda.com/articles/article1184-an-interface-in-csharp-.aspx. Enjoy Reading!

Nice one Zinnia Sarkar.. Thanks for Great explanation...

Thanks Vijayakumarp!