Read and Write Excel using open xml in c#

ReadWriteExcel.cs

using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ReadWriteExcelUsingOpenXml.Shared
{
    public class Helper
    {
        public static DataTable ReadExcelSheet(string fname, bool firstRowIsHeader = true)
        {
            List<string> Headers = new List<string>();
            DataTable dt = new DataTable();
            using (SpreadsheetDocument doc = SpreadsheetDocument.Open(fname, false))
            {
                //Read the first Sheets 
                Sheet sheet = doc.WorkbookPart.Workbook.Sheets.GetFirstChild<Sheet>();
                Worksheet worksheet = (doc.WorkbookPart.GetPartById(sheet.Id.Value) as WorksheetPart).Worksheet;
                IEnumerable<Row> rows = worksheet.GetFirstChild<SheetData>().Descendants<Row>();
                int counter = 0;
                foreach (Row row in rows)
                {
                    counter = counter + 1;
                    //Read the first row as header
                    if (counter == 1)
                    {
                        var j = 1;
                        foreach (Cell cell in row.Descendants<Cell>())
                        {
                            var colunmName = firstRowIsHeader ? GetCellValue(doc, cell) : "Field" + j++;
                            Console.WriteLine(colunmName);
                            Headers.Add(colunmName);
                            dt.Columns.Add(colunmName);
                        }
                    }
                    else
                    {
                        dt.Rows.Add();
                        int i = 0;
                        foreach (Cell cell in row.Descendants<Cell>())
                        {
                            dt.Rows[dt.Rows.Count - 1][i] = GetCellValue(doc, cell);
                            i++;
                        }
                    }
                }

            }
            return dt;
        }       

        public static void CreateExcelFile(DataTable table, string destination)
        {
            var ds = new DataSet();
            ds.Tables.Add(table);
            ExportDSToExcel(ds, destination);
        }

        private static string GetCellValue(SpreadsheetDocument doc, Cell cell)
        {
            string value = cell.CellValue.InnerText;
            if (cell.DataType != null && cell.DataType.Value == CellValues.SharedString)
            {
                return doc.WorkbookPart.SharedStringTablePart.SharedStringTable.ChildElements.GetItem(int.Parse(value)).InnerText;
            }
            return value;
        }

        public static void ExportDSToExcel(DataSet ds, string destination)
        {
            // https://stackoverflow.com/questions/11811143/export-datatable-to-excel-with-open-xml-sdk-in-c-sharp
            using (var workbook = SpreadsheetDocument.Create(destination, DocumentFormat.OpenXml.SpreadsheetDocumentType.Workbook))
            {
                var workbookPart = workbook.AddWorkbookPart();
                workbook.WorkbookPart.Workbook = new DocumentFormat.OpenXml.Spreadsheet.Workbook();
                workbook.WorkbookPart.Workbook.Sheets = new DocumentFormat.OpenXml.Spreadsheet.Sheets();

                uint sheetId = 1;

                foreach (DataTable table in ds.Tables)
                {
                    var sheetPart = workbook.WorkbookPart.AddNewPart<WorksheetPart>();
                    var sheetData = new DocumentFormat.OpenXml.Spreadsheet.SheetData();
                    sheetPart.Worksheet = new DocumentFormat.OpenXml.Spreadsheet.Worksheet(sheetData);

                    DocumentFormat.OpenXml.Spreadsheet.Sheets sheets = workbook.WorkbookPart.Workbook.GetFirstChild<DocumentFormat.OpenXml.Spreadsheet.Sheets>();
                    string relationshipId = workbook.WorkbookPart.GetIdOfPart(sheetPart);

                    if (sheets.Elements<DocumentFormat.OpenXml.Spreadsheet.Sheet>().Count() > 0)
                    {
                        sheetId =
                            sheets.Elements<DocumentFormat.OpenXml.Spreadsheet.Sheet>().Select(s => s.SheetId.Value).Max() + 1;
                    }

                    DocumentFormat.OpenXml.Spreadsheet.Sheet sheet = new DocumentFormat.OpenXml.Spreadsheet.Sheet() { Id = relationshipId, SheetId = sheetId, Name = table.TableName };
                    sheets.Append(sheet);

                    DocumentFormat.OpenXml.Spreadsheet.Row headerRow = new DocumentFormat.OpenXml.Spreadsheet.Row();

                    List<String> columns = new List<string>();
                    foreach (DataColumn column in table.Columns)
                    {
                        columns.Add(column.ColumnName);

                        DocumentFormat.OpenXml.Spreadsheet.Cell cell = new DocumentFormat.OpenXml.Spreadsheet.Cell();
                        cell.DataType = DocumentFormat.OpenXml.Spreadsheet.CellValues.String;
                        cell.CellValue = new DocumentFormat.OpenXml.Spreadsheet.CellValue(column.ColumnName);
                        headerRow.AppendChild(cell);
                    }

                    sheetData.AppendChild(headerRow);

                    foreach (DataRow dsrow in table.Rows)
                    {
                        DocumentFormat.OpenXml.Spreadsheet.Row newRow = new DocumentFormat.OpenXml.Spreadsheet.Row();
                        foreach (String col in columns)
                        {
                            DocumentFormat.OpenXml.Spreadsheet.Cell cell = new DocumentFormat.OpenXml.Spreadsheet.Cell();
                            cell.DataType = DocumentFormat.OpenXml.Spreadsheet.CellValues.String;
                            cell.CellValue = new DocumentFormat.OpenXml.Spreadsheet.CellValue(dsrow[col].ToString()); //
                            newRow.AppendChild(cell);
                        }

                        sheetData.AppendChild(newRow);
                    }
                }
            }
        }
    }
}

Hello, kzelda i want to get empty cell in spreadsheet. please help me.