Child list for field 'BusN' cannot be created. ปัญหาเรื่องการแสดงข้อมูล โดยใช้ Databinding , DataView และฐานข้อมูล !

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



namespace TxtSearch
{
    public partial class Search_From : Form
    {
        public Search_From()
        {
            InitializeComponent();
        }
        private void Search_From_Load(object sender, EventArgs e)
        {
            
        }
        private void btnSearch_Click(object sender, EventArgs e)
        {
            string strData = txtSearch.Text;
            string conStr = "Provider=Microsoft.Ace.OleDb.12.0;" + @"Data Source=C:\Users\Plugfai\Documents\Visual Studio 2008\Projects\Project\Bus Transport of Bangkok.accdb";
            OleDbConnection conn = new OleDbConnection(conStr);
            conn.Open();

            string sql = "SELECT * FROM BusLine";
            OleDbCommand cmd = new OleDbCommand(sql, conn);

            OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);

            DataSet data = new DataSet(); 
            adapter.Fill(data, "BusN");
            /*txtshow.Text = data.Tables["BusN"].Rows[0]["Ramble"].ToString(); */
            /*txtshow.DataBindings.Add("Text", data, "BusN.Ramble");*/

            DataView dv = new DataView(data.Tables["BusN"]); 
            dv.RowFilter = "Bus_Number = 'strData'";

            if (strData == "")
            {
                MessageBox.Show("กรุณากรอกเลขสาย หรือสถานที่ค่ะ", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
                txtshow.DataBindings.Add("Text", dv, "BusN.Ramble");
                
                
             conn.Close(); 
        }

      
    }
}