System.IO.StreamReader fileToPrint;
System.Drawing.Font printFont;
        protected void button1_Click(object sender, System.EventArgs e)
        {
            string printPath = System.Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory); //System.Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
           fileToPrint = new System.IO.StreamReader(printPath + @"\Kiosk2\printme.txt");
           printFont = new System.Drawing.Font("Arial", 10);
           printDocument1.Print();
           fileToPrint.Close();
        }

        private void printDocument1_printPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            float yPos = 0f;
            int count = 0;
            float leftMargin = e.MarginBounds.Left;
            float topMargin = e.MarginBounds.Top;
            string line = null;
            float linesPerPage = e.MarginBounds.Height/printFont.GetHeight(e.Graphics);
            while (count < linesPerPage)
            {
                line = fileToPrint.ReadLine();
                if (line == null)
            {
                break;
            }
                yPos = topMargin + count * printFont.GetHeight(e.Graphics);
                e.Graphics.DrawString(line, printFont, Brushes.Black, leftMargin, yPos, new StringFormat());
                count++;
            }
            if (line != null)
            {
            e.HasMorePages = true;
            }
        }