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Код

       private BindingSource bs;
        private DataTable dt;
       //Загрузка
        private void button1_Click(object sender, EventArgs e)
        {
            bs = new BindingSource();
            OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\;Extended Properties=dBASE IV;User ID=Admin;Password=");
            con.Open();
            OleDbCommand create = con.CreateCommand();
            create.CommandText = "SELECT * FROM Some.DBF";
            dt = new DataTable();
            dt.Load(create.ExecuteReader());
            bs.DataSource = dt;
            bs.AllowNew = true;
            dataGridView1.DataSource = bs;
            con.Close();
        }
        //Попытка внесения изменений
        private void button2_Click(object sender, EventArgs e)
        {
            bs.EndEdit();
            dt.AcceptChanges();
            dataGridView1.Refresh();
        }