Text Coder

        private void button1_Click(object sender, EventArgs e)
        {
            string otext = textBox1.Text;
            string ntext = string.Empty;
            for (int i = 0; i < textBox1.Text.Length; i++)
            {
                int j = char.ConvertToUtf32(otext, i);
                ntext += char.ConvertFromUtf32(255-j );

            }
            textBox1.Text = ntext;
        }