factory create method in C#?
class TwsCom {

  private ApiComObject apiComObject;

  public TwsCom() {
    apiComObject = new ApiComObject(); // create an instance, if required
  }
  // you might want to keep this variable type private to avoid breaking
  // the rules
  private ActiveXType NewActiveXType() {
    return apiComObject.Create();
  }

  public object SomeMethod() {
    ActiveXType activeX = NewActiveXType();
    return activeX.SomeMethod();
  }

}