private void WriteColumnHeading(uint columnIndex, string headerName)
{
string columnName = ExcelUtility.GetColumnNameFromIndex(columnIndex);
ExcelUtility.EnsureColumn(Worksheet, columnIndex);
if (columnIndex > 1)
{
ExcelUtility.CopyCell(Worksheet, "A", HeaderRowIndex, columnName, HeaderRowIndex);
}
ExcelUtility.SetSharedStringCell(Document, Worksheet, columnName, HeaderRowIndex, headerName);
}