How to convert a text file or a document to binary one and how to display the data

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs ev)
     {
         string strText = this.richTextBox2.Text;
         StreamReader myReader = new StreamReader(strText);
         float linesPerPage = 0;
         float yPosition = 0;
         int count = 0;
         float leftMargin = ev.MarginBounds.Left;
         float topMargin = ev.MarginBounds.Top;
         string line = null;
         Font printFont = this.richTextBox1.Font;
         SolidBrush myBrush = new SolidBrush(Color.Black);
         // Work out the number of lines per page, using the MarginBounds.
         linesPerPage = ev.MarginBounds.Height / printFont.GetHeight(ev.Graphics);
         // Iterate over the string using the StringReader, printing each line.
         while (count < linesPerPage && ((line = myReader.ReadLine()) != null))
         {
             // calculate the next line position based on the height of the font according to the printing device
             yPosition = topMargin + (count * printFont.GetHeight(ev.Graphics));
             // draw the next line in the rich edit control
             ev.Graphics.DrawString(line, printFont, myBrush, leftMargin, yPosition, new StringFormat());
             count++;
         }
         // If there are more lines, print another page.
         if (line != null)
             ev.HasMorePages = true;
         else
             ev.HasMorePages = false;
         myBrush.Dispose();
     }