FileStream -> MemoryStream -> FileStream

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

FileStream fs = File.OpenRead(filePath);   MemoryStream ms = new MemoryStream(); ms.SetLength(fs.Length);   fs.Read(ms.GetBuffer(), 0, (int)ms.Length); fs.Close();                 fs = File.OpenWrite(filePath + ".bak"); ms.WriteTo(fs);   fs.Close(); ms.Close(); fs = null; ms = null;