文字揃え
xlRange = (Range^)ws->Range["A1","A1"];
xlRange->HorizontalAlignment = Horizon// 横位置

[Horizon]
xlRange->HorizontalAlignment = Constants::xlCenter;// センター揃え
xlRange->HorizontalAlignment = Constants::xlRight;// 右揃え
xlRange->HorizontalAlignment = Constants::xlLeft;// 左揃え

System::Runtime::InteropServices::Marshal::ReleaseComObject(xlRange);