Interface fully qualified names, C#

Interface fully qualified names

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
   interface IA
    {
        
       
        int ID
        {
            get;
            set;
        }
          void A_InterFace1();
          
        
       void A_InterFace2();   
        
    }
    
    interface IB
    {
        
       
        int ID
        {
            get;
            set;
        }
          void B_InterFace1();
          
        
       void B_InterFace2();   
        
    }
    
    
    
    class B:IA,IB
    {
        private int Z,Y;
      public B()
        {
        }
        
       int IA.ID
        { 
              get
             {
                Console.WriteLine("Implement Property ID from IA in B");
                 return Z;
             }
              set{Z=value;}
        }
        public  void B_Method()
        {
               Console.WriteLine("B Method");
        }
          void IA.A_InterFace1()
        {
            Console.WriteLine("Implement Interface1 from IA in B");
        }
         public  void A_InterFace2()
        {
            Console.WriteLine("Implement Interface2 from IA in B");
        }
        
        
        
           int IB.ID
        {
              get
             {
                Console.WriteLine("Implement Property RN from IB in B");
                 return Y;
             }
              set{Y=value;}
        }
          void IB.B_InterFace1()
          {
               Console.WriteLine("Implement Interface1 from IB in B");
              
          }
          
        
       public void B_InterFace2()
       {
           
            Console.WriteLine("Implement Interface2 from IB in B");
       }
    }
   class C:IA
    {
       private int X;
      public C()
        {
        }
        
        public int ID
        {
              get
             {
                 Console.WriteLine("Implement Property ID in C");
                 return X;
             }
              set{X=value;}
        }
        public void C_Method()
        {
               Console.WriteLine("C Method");
        }
        public  void A_InterFace1()
        {
            Console.WriteLine("Implement Interface1 in C");
        }
         public  void A_InterFace2()
        {
            Console.WriteLine("Implement Interface2 in C");
        }
    }
   
    public class Program
    {
        public static void Main(string[] args)
        {
            
           IA b=new B();
            B b1=new B();
            //b1.A_InterFace1();//not accessable since A_Interface1 is fully qualified 
            b.A_InterFace1();
           IA c=new C();
            b.A_InterFace1();
                                               // b.B_Method();//No B's method is accessable from IA's reference variable as it knows only IA's methods.
            c.A_InterFace1();
            //b1.ID=100;
            b.ID=25;
            //c.ID=50;
            C c1=new C();
            c1.ID=500;
            
            Console.WriteLine("ID from B: "+b.ID);
            Console.WriteLine("ID from C: "+c1.ID);
        }
    }
}


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