public override void Undo()
{
//in error case try delete dummy file
Helpers2.DeleteDummyFile((DTE)this.GetService(typeof(DTE)), null, false);
}
public override void Execute()
{
EnvDTE.DTE service = this.GetService <EnvDTE.DTE>(true);
Helpers2.DeleteDummyFile(service, ParentItem, true);
}