Example of Principle Tell don't Ask

Ask_Version.cs

private class Screen
{
  Form mainForm = ...
  private void Screen_Loaded(object sender, ControlLoadedEventArgs e)
  {
    if(mainForm.InputControls != null && mainForm.InputControls.Contains("Id"))
      mainForm.InputControls["Id"].Editable = isEditable;
  }
}

Tell_Version.cs

private class Screen
{
  Form mainForm = ...
  private void Screen_Loaded(object sender, ControlLoadedEventArgs e)
  {
    mainForm.SetControlEditable("Id");
  }
}