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using System;
 
namespace TestAppication  
  { 
    public class MainClass 
    {
      abstract class CBaseClass 
      {
      public int iCount;
 
      public CBaseClass() {
      Console.WriteLine("CbaseClass created");
      icount=30;
      }
 
      public virtual void Add() {
      iCount+=20; 
      }  
 
      public virtual void Add() {
      iCount+=20;
      } 
 
      public virtual void Add(int iAdd) {
      iCount+=iAdd;
      } 
 
      public void Subtract(){
      iCount-=20;
      }
 
      public abstract void Subtract(int iSubtract);
 
     public override string ToString() { 
     return base.ToString()+"-- Methods of CBaseClass";
     }
 
    ~CBaseClass() {
     Console.WriteLine("CBaseClass deleted");
    }
 
    };  
 
   class CDerivedClass : CBaseClass 
   {
     public CDerivedClass() {
     Console.WriteLine("CDerivedClass created");
     iCount = 50;
     }
 
     public override void add() {
     iCount+=20;
     }
 
     public void add(int iAdd) {
     iCount+=iAdd; 
     }
 
     public void Subtract() {
     iCount-=10;
     }
 
     ~CDerivedClass() {
      Console.WriteLine("CDerivedClass deleted");
     }
   };
 
static void main () {
 
CDerivedClass deriveObject = new CDerivedClass();
CBaseClass basePointer  = new CDerivedClass();
CDerivedClass notUsed;
 
Console.WriteLine("1: " +deriveObject.iCount);
deriveObject.Add();
 
Console.WriteLine("2: " +deriveObject.iCount);
basePointer.Add(30);
 
Console.WriteLine("3: " +basePointer.iCount);
basePointer.Subtract();
 
Console.WriteLine("4: " +basePointer.iCount);
basePointer.Subtract(20);
 
Console.WriteLine("5: " +basePointer.iCount);
 
Console.WriteLine("6: {0}" , basePointer);
 
}
}
}
 

prog.cs(20,27): error CS0111: A member `TestAppication.MainClass.CBaseClass.Add()' is already defined. Rename this member or use different parameter types
prog.cs(16,27): (Location of the symbol related to previous error)
prog.cs(51,27): error CS0115: `TestAppication.MainClass.CDerivedClass.add()' is marked as an override but no suitable method found to override
prog.cs(59,18): warning CS0108: `TestAppication.MainClass.CDerivedClass.Subtract()' hides inherited member `TestAppication.MainClass.CBaseClass.Subtract()'. Use the new keyword if hiding was intended
prog.cs(28,19): (Location of the symbol related to previous warning)
Compilation failed: 2 error(s), 1 warnings

Standard output is empty