public void Unsubtotal()
{
using (var rows = Sheet.Rows(_range.FirstRow().RowNumber(), _range.LastRow().RowNumber()))
rows.Ungroup(true);
IXLRangeRow row = _range.FirstRow();
while (!row.IsEmpty())
{
if (row.IsSummary())
{
Sheet.Row(row.RowNumber()).Delete();
row = row.Unsubscribed().RowAbove();
}
row = row.Unsubscribed().RowBelow();
}
row.Dispose();
}