Как вывести данные из таблицы Access в DataGridView используя ComboBox?

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace DG
{
    public partial class MainForm : Form
    {
        private OleDbConnection connection = new OleDbConnection();
        public MainForm()
        {
            InitializeComponent();
            LoadData();
        }
        private void LoadData()
        {
            string connectString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db.mdb";
            OleDbConnection connection = new OleDbConnection(connectString);           
        connection.Open();
        string query = "select * from tovar ORDER by ide";
                OleDbCommand command = new OleDbCommand(query, connection);
             OleDbDataReader reader = command.ExecuteReader();
             List<string[]> data = new List<string[]>();
             while(reader.Read())
             {
                 data.Add(new string[5]);
                 data[data.Count-1][0]= reader[0].ToString();
                 data[data.Count-1][1]= reader[1].ToString();
                 data[data.Count-1][2]= reader[2].ToString();
                 data[data.Count-1][3]= reader[3].ToString();
                 data[data.Count-1][4]= reader[4].ToString();
             }
             reader.Close();
             connection.Close();
 
             foreach (string[] s in data)
                 dataGridView1.Rows.Add(s);
    }
        void Btn_saveClick(object sender, EventArgs e)
        {
            try
            {
            connection.Open();
            OleDbCommand command = new OleDbCommand();
            command.Connection = connection;
command.CommandText = "INSERT into tovar (ide, Name, prihod, rashod, ostatok) values('"+txt_ide.Text + "','" + txt_name.Text + "','" + txt_prihod.Text + "','" + txt_rashod.Text + "','" + txt_ostatok.Text + "')";            
command.ExecuteNonQuery();
MessageBox.Show("Data Saved");
dataGridView1.Rows.Clear();
LoadData();
}
catch (Exception ex)
{
MessageBox.Show("Error" + ex);
}
connection.Close();
}
void Button1Click(object sender, EventArgs e)
{
LoadData();
}
void Button2Click(object sender, EventArgs e)
{
dataGridView1.Rows.Clear();
LoadData();
connection.Close();
}
void Txt_deleteClick(object sender, EventArgs e)
{
try
{
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query="delete from tovar where ide = " +txt_ide.Text +"";
MessageBox.Show(query);
command.CommandText = query;
command.ExecuteNonQuery();
MessageBox.Show("Data Deleted");
}
catch (Exception ex)
{
MessageBox.Show("Error" + ex);
}
}
}
}

 string connectString = @"Provider=Microsoft.Jet.OLEDB.4.0ata Source=db.mdb";
        OleDbConnection connection;
        DataTable table;
        OleDbDataAdapter adapter;
        public void Connect()
        {
           connection = new OleDbConnection(connectString);
        }
        public DataTable RunQuery(string stringQuery)
        {
            adapter = new OleDbDataAdapter(stringQuery, connection);
            table = new DataTable();
           adapter = new OleDbDataAdapter();
            adapter.Fill(table);
            return table;
        }
 
 
 
private void button2_Click(object sender, EventArgs e)
        {
 Connect();
                comboBox1.DataSource = RunQuery("select ide, Name, prihod, rashod, ostatok from tovar ORDER by ide");
                comboBox1.DisplayMember = "Сюда пишем название колоки которую хотим видеть в ComboBox";
                comboBox1.ValueMember = "Сюда пишем название колонки, при выборе значение";
 
                dataGridView1.DataSource = RunQuery(string.Format("select * from tovar where Название колонки= {0}", comboBox1.SelectedValue));
                connection.Close();
        }