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        private void button1_Click(object sender, EventArgs e)
        {
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            byte [] bt = System.Text.Encoding.Default.GetBytes(str);
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            using (FileStream fs = new FileStream("file.postfix", FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
            {
                using (BinaryWriter writer = new BinaryWriter(fs))
                {
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                    foreach (byte b in bt)
                    {
                        writer.Write(b.ToString());
                    }              &nb


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