what is interface? step by step procedure to use interface .

Question

what is interface? step by step procedure to use interface in asp.net using c#

Shambhu · Answer

Interface : An interface contains only the signatures of methods delegates or events. It contains only pure virtual methods which required to implement in the derived class that implements the interface. Interfaces in C # provide a way to achieve runtime polymorphism. public interface IPayment { void MakePayment(string a int b=0); } public class PayPay : IPayment { public void MakePayment(string a); // it needs only one parameter } public class Google : IPayment { public void MakePayment(string a int b); // it needs two parameters. } Interface can be implemented implecitly or explicitly http://blogs.msdn.com/b/mhop/archive/2006/12/12/implicit-and-explicit-interface-implementations.aspx