WriteResourceToFile

 private static void ExtractFiles()
        {
           WriteResourceToFile("ArpScanner.Resources.oui.txt", "oui.txt");
        }

        private static void WriteResourceToFile(string resourceName, string fileName)
        {
            int bufferSize = 4096; // set 4KB buffer
            byte[] buffer = new byte[bufferSize];
            using (Stream input = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName))
            {
                using (Stream output = new FileStream(Directory.GetCurrentDirectory() + "\\" + fileName, FileMode.Create))
                {
                    int byteCount = input.Read(buffer, 0, bufferSize);
                    while (byteCount > 0)
                    {
                        output.Write(buffer, 0, byteCount);
                        byteCount = input.Read(buffer, 0, bufferSize);
                    }
                }
            }
        }