C# açık olan dosyaları kopyalama

using(var inputFile = new FileStream(
         "oldFile.txt", 
         FileMode.Open, 
         FileAccess.Read, 
         FileShare.ReadWrite))
     {
        using (var outputFile = new FileStream("newFile.txt", FileMode.Create))
        { 
            var buffer = new byte[0x10000];
            int bytes;

            while ((bytes = inputFile.Read(buffer, 0, buffer.Length)) > 0) 
            {
                outputFile.Write(buffer, 0, bytes);
            }
        }
    }