using Microsoft.Office.Interop.Word;
using System.IO;

namespace SpecialFeatures40
{
    class Interop
    {
        static void Main(string[] args)
        {   //Create a Word application
            Application wordApp = new Application(); 
            
            //Open a Word document
            DirectoryInfo di = new DirectoryInfo(".");
            var doc = wordApp.Documents.Open(di.FullName + "\\MyFile.doc");
  
            //Check the spelling
            doc.CheckSpelling();       
        }
    }
}