How to implement Interface Methods Partially

Here is the way to implement interface methods partially. To achieve this we need to use Abstract methods in derived class.
  1. Interface IExample  
  2. {  
  3.       void Display1();  
  4.       void Display2();  
  5.       void Display3();  
  6. }  
  7. public abstract class Cls1 : IExample  
  8. {  
  9.       public void Display1()  
  10.       {  
  11.             throw new NotImplementedException();  
  12.       }  
  13.       public abstract void Display2();  
  14.       public abstract void Display3();  
  15. }