Копирование колонок Excel

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void copy(MSOfficeBookMark_RU bookMark1, MSOfficeBookMark_RU bookMark2, int _workSheet = 1)
{
    Com Range1,Range2;
    Com workSheet;

    if (m_comDocument)
    {
        Range1 = this.findRange(bookMark1, _workSheet);
        Range2 = this.findRange(bookMark2, _workSheet);
        range1.copy();
        workSheet = this.getWorkSheet(_workSheet);
        workSheet.paste(range2);
    }

}