using System;
using System.IO;
using System.Text;
public class MainClass
{
static void Main() {
using( FileStream fs = File.Open( "log.txt", FileMode.Append, FileAccess.Write, FileShare.None ) ) {
Byte[] msg = new UTF8Encoding(true).GetBytes("string \n");
fs.Write( msg, 0, msg.Length );
}
}
}