C#

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I'm currently blogging about: How 'bout a little guitar now?
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);
BinaryReader br = new BinaryReader(fs);
BinaryWriter bw = new BinaryWriter(fs);
fs.Seek(123, SeekOrigin.Begin); // start reading with 123 bytes offset
byte[] buf = br.ReadBytes(16);
for (int i=0; i<buf.Length; i++)
  buf[i] ^= 128;
fs.Seek(123, SeekOrigin.Begin);
bw.Write(buf);
bw.Close(); // the underlying stream is closed as well
MessageBox.Show("Congratulations, you have ruined '"+filePath+"'!");

MessageBox.Show ( "The Index of the checked item is " + e.Index.ToString() +<br />
				"\n Its state was" + e.CurrentValue.ToString() + "\n and now its state is " <br />
				+ e.NewValue.ToString());