using System;
using System.Data;
using System.IO;
using Bytescout.Spreadsheet;
using Bytescout.Spreadsheet.Utils;
using System.Diagnostics;

namespace SimpleXMLConverterSample
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            // sample XLS to XML conversion
            SampleXLStoXMLConversion();
            // sample XML to XLS conversion
            SampleXMLtoXLSConversion();
        }

        /// <summary>
        /// shows how to convert existing XLS (Excel) document into XML using Bytescout.Spreadsheet and Bytescout.Spreadsheet.Utils.SimpleXMLConverter
        /// </summary>
        private static void SampleXLStoXMLConversion(){
            Spreadsheet document;

            // read XLS and save as XML
            document = new Spreadsheet();
    document.LoadFromFile("AdvancedReport.xls");
            SimpleXMLConverter tools = new SimpleXMLConverter(document);
            tools.SaveXML("AdvancedReport.xml");
            document.Close();
        }

        /// <summary>
        /// shows how to convert XML data into XLS excel using Bytescout.Spreadsheet and Bytescout.Spreadsheet.Utils.SimpleXMLConverter
        /// </summary>
        private static void SampleXMLtoXLSConversion()
        {
            // read XML and convert into XLS (Excel) and save

            Spreadsheet document = new Spreadsheet();

            SimpleXMLConverter tools = new SimpleXMLConverter(document);

            tools.LoadXML("AdvancedReport.xml");

            // delete output file if exists already
            if (File.Exists("Output.xls")){
                File.Delete("Output.xls");
            }

            // Save document
            document.SaveAs("Output.xls");

            // Close Spreadsheet
            document.Close();

            // open generated XLS document in default program
            Process.Start("Output.xls");

        }
    }

}

using System;
using System.Data;
using System.IO;
using Bytescout.Spreadsheet;

namespace Bytescout.Spreadsheet.Utils
{
    /// <summary>
    /// class for simple XLS to XML and XML to XLS conversion
    /// </summary>
    public class SimpleXMLConverter
    {
        private readonly Spreadsheet document;

        public SimpleXMLConverter(Spreadsheet document)
        {
            this.document = document;
        }

        public void LoadXML(string path)
        {
            DataSet dataSet = new DataSet();
            dataSet.ReadXml(path);

            foreach (DataTable table in dataSet.Tables)
            {
                Worksheet worksheet = document.Workbook.Worksheets.Add(table.TableName);

                // Add columns
                worksheet.Columns.Insert(0, table.Columns.Count);

                /*// Add row for header
                worksheet.Rows.Insert(0);

                // Fill headers
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    worksheet.Cell(1, i).Value = table.Columns[i].ColumnName;
                }*/

                // Add rows for data
                worksheet.Rows.Insert(0, table.Rows.Count);

                // Fill data
                for (int i = 0; i < table.Rows.Count; i++)
                {
                    for (int j = 0; j < table.Columns.Count; j++)
                    {
                        worksheet.Cell(i + 1, j).Value = table.Rows[i][j].ToString();
                    }
                }
            }
        }

        public void SaveXML(string path)
        {
            DataSet dataSet = new DataSet();

            for (int i = 0; i < document.Workbook.Worksheets.Count; i++)
            {
                Worksheet worksheet = document.Workbook.Worksheets[i];

                DataTable table = dataSet.Tables.Add(worksheet.Name);

                #region Add Columns

                for (int column = 0; column <= worksheet.UsedRangeColumnMax; column++)
                {
                    table.Columns.Add(
                        string.Format("Column_{0}", column));
                }

                #endregion

                #region Add rows

                for (int row = 0; row <= worksheet.UsedRangeRowMax; row++)
                {
                    object[] data = new object[worksheet.UsedRangeColumnMax + 1];

                    for (int column = 0; column <= worksheet.UsedRangeColumnMax; column++)
                    {
                        if (worksheet.Cell(row, column).Value != null &&
                            worksheet.Cell(row, column).Value.ToString().Trim() == "")
                            data[column] = null;
                        else
                            data[column] = worksheet.Cell(row, column).Value;
                    }

                    table.Rows.Add(data);
                }

                #endregion
            }

            dataSet.WriteXml(path);
        }

        private void PrintDataSet(DataSet ds)
        {
            Console.WriteLine("DataSet name: {0}", ds.DataSetName);
            foreach (DataTable table in ds.Tables)
            {
                int rowCount = table.Rows.Count;
                int columnCount = table.Columns.Count;

                Console.WriteLine("\nTable: {0} ({1} rows)", table.TableName, rowCount);
                foreach (DataColumn column in table.Columns)
                {
                    Console.Write("{0}\t", column.ColumnName);
                }
                Console.WriteLine();

                for (int i = 0; i < rowCount; i++)
                {
                    for (int column = 0; column < columnCount; column++)
                    {
                        Console.Write("{0}\t", table.Rows[i][column]);
                    }

                    Console.WriteLine();
                }
            }
        }
    }
}