ขอตัวอย่างและคำแนะนำในการออกใบเสร็จรับเงินด้วยภาษา c# ด้วยครับ

using System;
using System.Windows.Forms;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ReportDocument cryRpt = new ReportDocument();
            cryRpt.Load("PUT CRYSTAL REPORT PATH HERE\CrystalReport1.rpt");

            TableLogOnInfos crtableLogoninfos = new TableLogOnInfos();
            TableLogOnInfo crtableLogoninfo = new TableLogOnInfo();
            ConnectionInfo crConnectionInfo = new ConnectionInfo();
            Tables CrTables;

            crConnectionInfo.ServerName = "YOUR SERVERNAME";
            crConnectionInfo.DatabaseName = "DATABASE NAME";
            crConnectionInfo.UserID = "USERID";
            crConnectionInfo.Password = "PASSWORD";

            CrTables = cryRpt.Database.Tables;
            foreach (CrystalDecisions.CrystalReports.Engine.Table CrTable in CrTables)
            {
                crtableLogoninfo = CrTable.LogOnInfo;
                crtableLogoninfo.ConnectionInfo = crConnectionInfo;
                CrTable.ApplyLogOnInfo(crtableLogoninfo);
            }

            cryRpt.Refresh();
            cryRpt.PrintToPrinter(2, true, 1, 2);

        }
   }
}