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FileStream FS = new FileStream("Source.File", FileMode.Open);
FS.Postion = 1000;
byte[] bData = new byte[1024];
FS.Read(bData, 0, bData.Length);
FS.Close();
FS = null;
FS = new FileStream("Dest.File", FileMode.Open);
FS.Postion = FS.Length;
FS.Write(bData, 0, bData.Length);
FS.Flush();
FS.Close();
FS = null;