interface does not work for me

hi, 

  please forgive me if ask beginner question. here code

  public interface idata    {      idata copy ();    }      ...    public class dataa : idata    {      public dataa copy ()      {        dataa mydataa = new dataa();        ...        return mydataa;      }    }  

  when compile, got error message, dataa.copy should return type idata. how implement properly? 

thank you, 

wes

 

---

wes

public idata copy () {...}

make return same type defined in interface, error message tells to.

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