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Program 4
using System;

[MyObsolete("Use class D instead")]
class C{
  // ...
}

class D{
  [MyObsolete("Do not call this method.",IsError=true)]
  public void M(){
  }
}

class E{
  public static void Main(){
    C c = new C();
    D d = new D();
    d.M();
  }
}