ดึงข้อมูลจาก gridview ของอีก form มาใส่ textbox แล้วข้อมูลมันไม่แสดงค่ะ

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Data.OleDb;
using System.Drawing.Printing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication2
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        string strConn = DBDataConn.strConn;
        OleDbConnection Con = new OleDbConnection();
        OleDbDataAdapter da;
        DataSet ds = new DataSet();
        OleDbCommand com;
        OleDbDataReader dr;
        //BindingSource bd;
        PrintDialog printDial = new PrintDialog();
        PrintDocument printDoc = new PrintDocument();

        DateTime date = DateTime.Now;
        string lastMaterialOrderID = "";
        bool IsFind = false;
        //bool IsFindShop = false;

        string pShopID = "";
        string pMaterialID = "";
        string pMaterialName = "";
        double pMaterialPrice = 0.0;
        string pUnit = "";

        string rShopID = "";
        string rNameShop = "";
        string rContactName = "";
        string rAddress = "";
        string rTelephone = "";

        private void Form2_Load(object sender, EventArgs e)
        {
            date = DateTime.Now;
            lblOrderDate.Text = date.ToShortDateString();
            dtpReceiveDate.Value = date.AddDays(7);
            dtpPaidDate.Value = date.AddMonths(1);

            lsvMaterial.Columns.Add("รหัสวัตถุดิบ", 70, HorizontalAlignment.Left);
            lsvMaterial.Columns.Add("ชื่อวัตถุดิบ", 125, HorizontalAlignment.Left);
            lsvMaterial.Columns.Add("จำนวนที่สั่งซื้อ", 85, HorizontalAlignment.Right);
            lsvMaterial.Columns.Add("ราคา/หน่วย", 75, HorizontalAlignment.Right);
            lsvMaterial.Columns.Add("หน่วนนับ", 70, HorizontalAlignment.Right);
            lsvMaterial.Columns.Add("รวมเป็นเงิน", 70, HorizontalAlignment.Right);

            lsvMaterial.View = View.Details;
            lsvMaterial.GridLines = true;

            if (Con.State == ConnectionState.Open)
                Con.Close();
            Con.ConnectionString = strConn;
            Con.Open();

            lblMaterialPrice.Text = "0.0";
            txtOrderNum.Text = "1";
            lblNet.Text = "0.00";

            txtDiscountRate.Text = "0";
            lblDiscount.Text = "0.00";

            printDoc.PrintPage += new PrintPageEventHandler(this.printDocument1_PrintPage);
            printDoc.DocumentName = "สั่งซื้อวัตถุดิบ";
            printDial.Document = printDoc;
        }

 }