Сохранение изменений в DataGridView

private void button1_Click(object sender, EventArgs e)
        {
OleDbConnection myOleDbConnection = new OleDbConnection(@"Provider = Microsoft.ACE.OLEDB.12.0; Data Source=coach1.accdb;Persist Security Info=False;");
            myOleDbConnection.Open();
            OleDbCommand myOleDbCommand = myOleDbConnection.CreateCommand();
            myOleDbCommand.CommandText = ("SELECT * FROM SACENSĪBAS");
            OleDbDataReader myOleDbDataReader = myOleDbCommand.ExecuteReader();
            myOleDbDataReader.Read();
 
 
 
            OleDbConnection testConnection = new OleDbConnection(@"Provider = Microsoft.ACE.OLEDB.12.0; Data Source=coach1.accdb;Persist Security Info=False;");
            testConnection.Open();
            OleDbCommand testCommand = testConnection.CreateCommand();
            testCommand.CommandText = ("SELECT * FROM SACENSĪBAS ");
           OleDbDataAdapter dataAdapter = new OleDbDataAdapter(testCommand);
            DataSet dataSet = new DataSet();
            dataAdapter.Fill(dataSet, "SACENSĪBAS");
            dataGridView1.Invalidate();
            dataGridView1.Refresh();
            dataGridView1.DataSource = dataSet.Tables["SACENSĪBAS"];
            dataGridView1.Sort(dataGridView1.Columns[0], ListSortDirection.Ascending); 
            dataAdapter.Update(dataSet.Tables["Sacensības"]);
            dataSet.AcceptChanges();
           
            dataGridView1.EndEdit();
            
            dataAdapter.Update(dataSet, "Sacensības");
            dataAdapter.Fill(dataSet, "Sacensības");
           
            dataSet.AcceptChanges();
 
 
            testConnection.Close();
}