create a document write text and save with Word

/*  
    create a document write text and save with Word 
    taken from Example01.cs
*/
private void Example01Main()
{
   // start word and turn off msg boxes
   Word.Application wordApplication = new Word.Application();
   wordApplication.DisplayAlerts = WdAlertLevel.wdAlertsNone;

   // add a new document
   Word.Document newDocument = wordApplication.Documents.Add();

   // insert some text
   wordApplication.Selection.TypeText("This text is written by NetOffice");

   wordApplication.Selection.HomeKey(WdUnits.wdLine, WdMovementType.wdExtend);
   wordApplication.Selection.Font.Color = WdColor.wdColorSeaGreen;
   wordApplication.Selection.Font.Bold = 1;
   wordApplication.Selection.Font.Size = 18;

   // save the document
   string fileExtension = GetDefaultExtension(wordApplication);
   object documentFile = 
          string.Format("{0}\\Example01{1}", Application.StartupPath, fileExtension);
   newDocument.SaveAs(documentFile);

   // close word and dispose reference
   wordApplication.Quit();
   wordApplication.Dispose();

   FinishDialog fDialog = new FinishDialog("Document saved.", documentFile.ToString());
   fDialog.ShowDialog(this);
}

#region Helper

/// <summary>
/// returns the valid file extension for the instance. for example ".doc" or ".docx"
/// </summary>
/// <param name="application">the instance</param>
/// <returns>the extension</returns>
private static string GetDefaultExtension(Word.Application application)
{
   double version = Convert.ToDouble(application.Version, CultureInfo.InvariantCulture);
   if (version >= 12.00)
       return ".docx";
   else
       return ".doc";
}

#endregion