public void Clear()
{
sheet.RemoveRange(RangeHelper.GetEntireCol(sheet, 1));
sheet.RemoveRange(RangeHelper.GetEntireCol(sheet, 1));
//.Delete(XlDeleteShiftDirection.xlShiftToLeft);
for (int i = 1; i < startRowIndex; i++)
{
sheet.RemoveRange(RangeHelper.GetEntireRow(sheet, 1));
// .Delete(XlDeleteShiftDirection.xlShiftUp);
}
}