ListView to Excel C#

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace TyroDeveloperDLL
{
    public class ListViewToExcel
    {
        /// 

        /// Export to Excel
        /// 
        /// Name of the ListView control
        /// Book name
        /// Folder to put the file. 
        /// To export a list of items
        /// C#: ExportToExcel(lvArticulos,"Items","C:\");
        public static void ExportToExcel(ListView lv, string prmBookName, string prmPath)
        {
            try
            {
                if (lv.Items.Count == 0)
                {
                    MessageBox.Show("No items to export",
                        "System Information", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                    return;
                }

                string[] st = new string[lv.Columns.Count];
                DirectoryInfo di = new DirectoryInfo(prmPath);
                if (di.Exists == false) di.Create();
                StreamWriter sw = new StreamWriter(prmPath + prmBookName + ".xls", false);
                sw.AutoFlush = true;
                for (int col = 0; col < lv.Columns.Count; col++)
                {
                    sw.Write("\t" + lv.Columns[col].Text.ToString());
                }
                int rowIndex = 1; int row = 0;
                string st1 = "";
                for (row = 0; row < lv.Items.Count; row++)
                {
                    if (rowIndex <= lv.Items.Count)
                        rowIndex++;
                    if (row == 0) st1 = "\n";
                    else st1 = "";
                    for (int col = 0; col < lv.Columns.Count; col++)
                    {
                        st1 = st1 + "\t" + "'" + lv.Items[row].SubItems[col].Text.ToString();
                    }
                    sw.WriteLine(st1);
                }
                sw.Close();
                FileInfo fil = new FileInfo(prmPath + prmBookName + ".xls");
                if (fil.Exists == true)
                    MessageBox.Show("¡Finished!\n" +
                        "File Name: " + prmPath + prmBookName,
                        "Export to Excel",
                        MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}

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