C# .NET Create Word Document (Windows 7 and Office 2003 , Office Word 2007)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Word = Microsoft.Office.Interop.Word;

namespace WordC
{
    public partial class frmWord : Form
    {
        public frmWord()
        {
            InitializeComponent();
        }

        private void Generate_Click(object sender, EventArgs e)
        {

            object mis = Type.Missing;
            object strFileName = (Object)"C:\\WordC\\Doc\\GenWord.doc";
            object fileFormat = 1;

            Object oTrue = true;
            Object oFalse = false;
                   
            Word.Application oWord = new Word.Application();
            Word.Document oWordDoc = new Word.Document();


            oWord.Visible = true;

            oWordDoc = oWord.Documents.Add(ref mis, ref mis, ref mis, ref mis);


            oWord.Selection.TypeText("Welcome To www.ThaiCreate.Com");

            oWordDoc.SaveAs(ref strFileName, ref fileFormat, ref mis, ref mis,
             ref mis, ref mis, ref mis, ref mis, ref mis,
             ref mis, ref mis, ref mis, ref mis, ref mis,
             ref mis, ref mis);

            oWordDoc.Close(ref oFalse, ref mis, ref mis);
            oWord.Quit(ref mis, ref mis, ref mis);
            GC.Collect();
        }
    }
}