how to print particular string in ascending/descending order using arrays?

          private void button1_Click(object sender, EventArgs e)

        {

            string str = this.textBox1.Text.Trim();

            char[] chars = str.ToCharArray();

            if (chars.Length > 0)

            {

                for (int i = 0; i < chars.Length; i++)

                {

                    for (int j = 0; j < chars.Length - 1; j++)

                    {

                        char temp = chars[j];

                        if (chars[j] > chars[j + 1])

                        {

                            chars[j] = chars[j + 1];

                            chars[j + 1] = temp;

                        }

                    }

                }

            }

            foreach (char c in chars)

                this.m_printText += c;

            PrintDialog dialog = new PrintDialog();

            PrintDocument doc = new PrintDocument();

            doc.PrintPage+=new PrintPageEventHandler(doc_PrintPage);

            dialog.AllowPrintToFile = true;

            dialog.Document = doc;

            if (dialog.ShowDialog() == DialogResult.OK)

                doc.Print();

        }

          protected void doc_PrintPage(Object sender, PrintPageEventArgs e)

        {

            Graphics g = e.Graphics;

            g.DrawString(this.m_printText,new System.Drawing.Font ("Arial",10,FontStyle.Regular),Brushes.Black,new System.Drawing.PointF(20,20));

            e.HasMorePages = false;



        }

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