Interfaces

Question

What are Interfaces and how they are usefull?
While Implimenting the interfaces we have to write the whole code again, so what is the use of Including Interfaces, instead write the codes without Implementing any interface.

Master Billa · Answer

Hi 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 as shown in the following example: 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(); } } more details here http://www.codersource.net/csharp_tutorial_interface.html thank you