รบกวนขอวิธี สั่งพิมพ์ textbox 5 ครั้ง ให้ random ตัวเลขที่อยู่ใน textbox โดยนับจาก textbox อันแรก

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TORServices.DatabaseTor
{
    public class PrintDataGridView
    {
        #region Variables

        int iCellHeight = 0; //Used to get/set the datagridview cell height
        int iTotalWidth = 0; //
        int iRow = 0;//Used as counter
        bool bFirstPage = false; //Used to check whether we are printing first page
        bool bNewPage = false;// Used to check whether we are printing a new page
        int iHeaderHeight = 0; //Used for the header height
        System.Drawing.StringFormat strFormat; //Used to format the grid rows.
        List<double> arrColumnLefts = new List<double>();//Used to save left coordinates of columns
        List<double> arrColumnWidths = new List<double>();//Used to save column widths
        private System.Drawing.Printing.PrintDocument _printDocument = new System.Drawing.Printing.PrintDocument();
        private System.Windows.Forms.DataGridView gw = new System.Windows.Forms.DataGridView();
        private string _ReportHeader;
        int iCount = 0;
        #endregion

        public PrintDataGridView(System.Windows.Forms.DataGridView gridview, string ReportHeader)
        {
            _printDocument.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(printDocument_PrintPage);
            _printDocument.BeginPrint += new System.Drawing.Printing.PrintEventHandler(printDocument_BeginPrint);
            gw = gridview;
            _ReportHeader = ReportHeader;

        }

        public void PrintForm()
        {

            System.Windows.Forms.PrintDialog printDialog = new System.Windows.Forms.PrintDialog();
            printDialog.Document = _printDocument;
            printDialog.UseEXDialog = true;
            //Get the document
            if (System.Windows.Forms.DialogResult.OK == printDialog.ShowDialog())
            {
                _printDocument.DocumentName = _ReportHeader + string.Format("{0:yyyyMMdd hhmmss}", DateTime.Now);
                _printDocument.Print();
            }

        }
        #region Begin Print Event Handler
        /// <span class="code-SummaryComment"><summary></span>
        /// Handles the begin print event of print document
        /// <span class="code-SummaryComment"></summary></span>
        /// <span class="code-SummaryComment"><param name=""sender""></param></span>
        /// <span class="code-SummaryComment"><param name=""e""></param></span>
        private void printDocument_BeginPrint(object sender,
            System.Drawing.Printing.PrintEventArgs e)
        {

            strFormat = new System.Drawing.StringFormat();
            strFormat.Alignment = System.Drawing.StringAlignment.Near;
            strFormat.LineAlignment = System.Drawing.StringAlignment.Center;
            strFormat.Trimming = System.Drawing.StringTrimming.EllipsisCharacter;

            if (arrColumnLefts != null) arrColumnLefts.Clear();
            if (arrColumnWidths != null) arrColumnWidths.Clear();
            arrColumnLefts = new List<double>();
            arrColumnWidths = new List<double>();
            iCellHeight = 0;
            iCount = 0;
            bFirstPage = true;
            bNewPage = true;

            // Calculating Total Widths
            iTotalWidth = 0;
            foreach (System.Windows.Forms.DataGridViewColumn dgvGridCol in gw.Columns)
            {
                iTotalWidth += dgvGridCol.Width;
            }
        }
        #endregion

        #region Print Page Event
        /// <span class="code-SummaryComment"><summary></span>
        /// Handles the print page event of print document
        /// <span class="code-SummaryComment"></summary></span>
        /// <span class="code-SummaryComment"><param name=""sender""></param></span>
        /// <span class="code-SummaryComment"><param name=""e""></param></span>
        private void printDocument_PrintPage(object sender,
            System.Drawing.Printing.PrintPageEventArgs e)
        {
            //Set the left margin
            int iLeftMargin = 50;// e.MarginBounds.Left;
            //Set the top margin
            int iTopMargin = e.MarginBounds.Top;
            //Whether more pages have to print or not
            bool bMorePagesToPrint = false;
            int iTmpWidth = 0;

            //For the first page to print set the cell width and header height
            if (bFirstPage)
            {
                foreach (System.Windows.Forms.DataGridViewColumn GridCol in gw.Columns)
                {
                    iTmpWidth = (int)(System.Math.Floor((double)((double)GridCol.Width /
                        (double)iTotalWidth * (double)iTotalWidth *
                        ((double)e.MarginBounds.Width / (double)iTotalWidth))));

                    iHeaderHeight = (int)(e.Graphics.MeasureString(GridCol.HeaderText,
                        GridCol.InheritedStyle.Font, iTmpWidth).Height) + 11;

                    // Save width and height of headers
                    arrColumnLefts.Add(iLeftMargin);
                    arrColumnWidths.Add(iTmpWidth);
                    iLeftMargin += iTmpWidth;
                }
            }
            //Loop till all the grid rows not get printed
            while (iRow <= gw.Rows.Count - 1)
            {
                System.Windows.Forms.DataGridViewRow GridRow = gw.Rows[iRow];
                //Set the cell height
                iCellHeight = GridRow.Height + 5;
                int iCount = 0;
                //Check whether the current page settings allows more rows to print
                if (iTopMargin + iCellHeight >= e.MarginBounds.Height + e.MarginBounds.Top)
                {
                    bNewPage = true;
                    bFirstPage = false;
                    bMorePagesToPrint = true;
                    break;
                }
                else
                {
                    if (bNewPage)
                    {
                        //Draw Header
                        e.Graphics.DrawString(_ReportHeader,
                            new System.Drawing.Font(gw.Font, System.Drawing.FontStyle.Bold),
                            System.Drawing.Brushes.Black, e.MarginBounds.Left,
                            e.MarginBounds.Top - e.Graphics.MeasureString(_ReportHeader,
                            new System.Drawing.Font(gw.Font, System.Drawing.FontStyle.Bold),
                            e.MarginBounds.Width).Height - 13);

                        String strDate = DateTime.Now.ToLongDateString() + " " +
                            DateTime.Now.ToShortTimeString();
                        //Draw Date
                        e.Graphics.DrawString(strDate,
                            new System.Drawing.Font(gw.Font, System.Drawing.FontStyle.Bold), System.Drawing.Brushes.Black,
                            e.MarginBounds.Left +
                            (e.MarginBounds.Width - e.Graphics.MeasureString(strDate,
                            new System.Drawing.Font(gw.Font, System.Drawing.FontStyle.Bold),
                            e.MarginBounds.Width).Width),
                            e.MarginBounds.Top - e.Graphics.MeasureString(_ReportHeader,
                            new System.Drawing.Font(new System.Drawing.Font(gw.Font, System.Drawing.FontStyle.Bold),
                            System.Drawing.FontStyle.Bold), e.MarginBounds.Width).Height - 13);

                        //Draw Columns                 
                        iTopMargin = e.MarginBounds.Top;
                        foreach (System.Windows.Forms.DataGridViewColumn GridCol in gw.Columns)
                        {
                            e.Graphics.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.LightGray),
                                new System.Drawing.Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                                (int)arrColumnWidths[iCount], iHeaderHeight));

                            e.Graphics.DrawRectangle(System.Drawing.Pens.Black,
                                new System.Drawing.Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                                (int)arrColumnWidths[iCount], iHeaderHeight));

                            e.Graphics.DrawString(GridCol.HeaderText,
                                GridCol.InheritedStyle.Font,
                                new System.Drawing.SolidBrush(GridCol.InheritedStyle.ForeColor),
                                new System.Drawing.RectangleF((int)arrColumnLefts[iCount], iTopMargin,
                                (int)arrColumnWidths[iCount], iHeaderHeight), strFormat);
                            iCount++;
                        }
                        bNewPage = false;
                        iTopMargin += iHeaderHeight;
                    }
                    iCount = 0;
                    //Draw Columns Contents                
                    foreach (System.Windows.Forms.DataGridViewCell Cel in GridRow.Cells)
                    {
                        if (Cel.Value != null)
                        {
                            e.Graphics.DrawString(Cel.Value.ToString(),
                                Cel.InheritedStyle.Font,
                                new System.Drawing.SolidBrush(Cel.InheritedStyle.ForeColor),
                                new System.Drawing.RectangleF((int)arrColumnLefts[iCount],
                                (float)iTopMargin,
                                (int)arrColumnWidths[iCount], (float)iCellHeight),
                                strFormat);
                        }
                        //Drawing Cells Borders 
                        e.Graphics.DrawRectangle(System.Drawing.Pens.Black,
                            new System.Drawing.Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                            (int)arrColumnWidths[iCount], iCellHeight));
                        iCount++;
                    }
                }
                iRow++;
                iTopMargin += iCellHeight;
            }
            //If more lines exist, print another page.
            if (bMorePagesToPrint)
                e.HasMorePages = true;
            else
                e.HasMorePages = false;
        }
        #endregion


    }
   

}