How to display message after priting specific number of lines

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C#3.5

PostgreSQL

Hi all

Below is the code i am using for printing specific number of lines per page

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            float linesPerPage = 0;
            float yPos = 0;
            int count = 0;
            float leftMargin = e.MarginBounds.Left;
            float topMargin = e.MarginBounds.Top;
            string line = null;
            

            // Calculate the number of lines per page.
            linesPerPage = 30;

         
                //MessageBox.Show("Turn the page to continue");

                // Print each line of the file. 
                while (count < linesPerPage &&
                   ((line = streamToPrint.ReadLine()) != null))
                {

                    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;
                   

                }
                else
                {
                    e.HasMorePages = false;
                }

But here suppose user has 40 lines to print, so at that time i want to display one messagebox after printing 30 lines.
once user tuen the page or put new page, it will print the remaining transactions.

Please help me how to do this..