[诚求答案][偶是菜鸟]C#如何保存DataGridView里多行数据？

public partial class Form1 : Form

    {

        private OleDbConnection connection = null;

        private OleDbCommand selectCommand = null;

        private OleDbDataAdapter dataAdapter = null;

        private string connectionString = 

            @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\..\DB\Customers.mdb;Persist Security Info=True";



        public Form1()

        {

            InitializeComponent();

        }



        private void Form1_Load(object sender, EventArgs e)

        {

            connection = new OleDbConnection(connectionString);

            selectCommand = connection.CreateCommand();

            selectCommand.CommandText = "SELECT CustomerID, CompanyName, ContactName, Address, Phone FROM Customers";

            dataAdapter = new OleDbDataAdapter();

            dataAdapter.SelectCommand = selectCommand;

            DataTable data = new DataTable();

            dataAdapter.Fill(data);

            this.dataGridView1.DataSource = data;



            OleDbCommandBuilder builder = new OleDbCommandBuilder(dataAdapter);

            dataAdapter.UpdateCommand = builder.GetUpdateCommand();

            dataAdapter.InsertCommand = builder.GetInsertCommand();

            dataAdapter.DeleteCommand = builder.GetDeleteCommand();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            DataTable data = (DataTable)this.dataGridView1.DataSource;

            DataTable changedData = data.GetChanges();



            if (changedData != null)

            {

                dataAdapter.Update(changedData);

                data.AcceptChanges();

            }

        }

    }