How to avoid copy-paste of exceptionness function?

I have fo开发者_JS百科llowing functionality in few different classes C1, D2, F34:

class C1
{
    void SomeFunc
    {
        Statement1();
        Obj = GetObj();
        Statement2(Obj);
    }
    IMyObj Obj{get;private set;}
}

public static class MyObjExt
{
    public static void Statement2(this IMyObj obj)
    {
        ... do validation of 'obj';
        ... throw exception if object state is wrong
    }
}

Classes C1, D2, F34 aren't member of same hierarchy.

so I would like to avoid copy paste of them.

I could do something like this:

static MyObj MyFunc()
{
  Statement1();
  IMyObj obj = GetObj();
  Statement2(obj);

  return obj;
}
class C1
{
  void SomeFunc
  {
      Obj = MyFunc();
  }
  IMyObj Obj{get;private set;}
}

but if "Statement2" function throws an exception obj member will left uninitialized...

How could I avoid copy-paste?

I have a little bit more complicated solution:

class Extender
{
    static IMyObj MyFunc(out IMyObj obj)
    {
        Statement1();
        obj = GetObj();
        Statement2(obj);
    }
}

class C1
{
  void SomeFunc
  {
    IMyObj obj=null;
    try
    {
         MyFunc(out obj);
    }
    finally
    {
        Obj = obj;
    }
  }
  IMyObj Obj{get;private set;}
}

But I not sure if it will and must work. Is this good or bad approach?

If you think it is good - please vote, if no - please point "why"?

Thanks a lot!

EDIT: Added 'SomeFunc' implementation after modification.