How To Convert Word To PDF File in C#

using System;
using System.Windows.Forms;
using System.IO;
using System.Data;
using System.Reflection;
using iTextSharp.text.pdf;
using iTextSharp.text;
using System.Net;
namespace Export_DataTable_PDF
{
public partial class Form1 : Form
{
   public Form1()
   {
      InitializeComponent();
      this.BindDataGridView();
   }
   private void BindDataGridView()
   {
      DataTable dt = new DataTable();
      dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
      new DataColumn("Name", typeof(string)),
      new DataColumn("Country",typeof(string)) });
      dt.Rows.Add(1, "John Hammond", "United States");
      dt.Rows.Add(2, "Mudassar Khan", "India");
      dt.Rows.Add(3, "Suzanne Mathews", "France");
      dt.Rows.Add(4, "Robert Schidner", "Russia");
      this.dataGridView1.DataSource = dt;
   }
   private void btnExportPdf_Click(object sender, EventArgs e)
   {
      //Creating iTextSharp Table from the DataTable data
      PdfPTable pdfTable = new PdfPTable(dataGridView1.ColumnCount);
      pdfTable.DefaultCell.Padding = 3;
      pdfTable.WidthPercentage = 30;
      pdfTable.HorizontalAlignment = Element.ALIGN_LEFT;
      pdfTable.DefaultCell.BorderWidth = 1;
      //Adding Header row
   foreach (DataGridViewColumn column in dataGridView1.Columns)
   {
      PdfPCell cell = new PdfPCell(new Phrase(column.HeaderText));
      cell.BackgroundColor = new iTextSharp.text.Color(240, 240, 240);
      pdfTable.AddCell(cell);
   }
   //Adding DataRow
   foreach (DataGridViewRow row in dataGridView1.Rows)
   {
      foreach (DataGridViewCell cell in row.Cells)
      {
         pdfTable.AddCell(cell.Value.ToString());
      }
   }
   //Exporting to PDF
   string folderPath = "D:\\NACH_Credit_Presentation20_14\\";
   if (!Directory.Exists(folderPath))
   {
      Directory.CreateDirectory(folderPath);
   }
   using (FileStream stream = new FileStream(folderPath + "DataGridViewExport.pdf", FileMode.Create))
   {
      Document pdfDoc = new Document(PageSize.A2, 10f, 10f, 10f, 0f);
      PdfWriter.GetInstance(pdfDoc, stream);
      pdfDoc.Open();
      pdfDoc.Add(pdfTable);
      pdfDoc.Close();
      stream.Close();
   }
}