Oops

That's nice. please mark the post as answer if it helped :)

Happy Learning.

om prakash,

I think you haven't practiced on the basics yet. A class and a Windows Form application are quite different things. A class is an architecture where you declare what has to be inside a class. See the example below:

-------------------------------------
class StudemtDetails{
        public string Name{get;set;}
        public int RollNo{get;set;}
        public string Address{get;set;}
}
-------------------------------------

This is an architecture which you're going to implement in your application whether it a Windows Form Application or it's  Web Application or any kind of that. You create objects of this class in your application and utilize it for your purposes.

Hope you understand what I mean. Please refer to the C# Programming Basics if you're still not clear.

Hope it helps :)

Hi om prakash,

find them here on C# Corner:

Delegates in C#
http://www.c-sharpcorner.com/UploadFile/Ashush/delegates-in-C-Sharp/

Inteface in C#
http://www.c-sharpcorner.com/UploadFile/3d39b4/interface-in-C-Sharp-part-1/
http://www.c-sharpcorner.com/UploadFile/3d39b4/interface-in-C-Sharp-part-2/

Explained very nicely.

Happy Learning :)