How I do Update Datagridview manual data enter?

private void verilerigoster_butun_ogrenciler()
       {


           lblbaslik.Text = "Bütün Sınıflar 1. Sınav Not Girişi";

           baglan.Open();
           ds.Tables.Clear();
           da = new OleDbDataAdapter("Select [ogrno], [adsoyad], [sinif], [1sorupuan1], [1sorupuan2], [1sorupuan3], [1sorupuan4], [1sorupuan5], [1sorupuan6], [1sorupuan7], [1sorupuan8], [1sorupuan9], [1sorupuan10], [1sorupuan11], [1sorupuan12], [toplampuan1], [derece1] from tarih order by sinif", baglan);
           da.Fill(ds, "tarih");
           dataGridView1.DataSource = ds.Tables[0];
           baglan.Close();

           da.Dispose();


           label1.Text = "Bütün Sınıflar";
           label2.Text = "Bütün Sınıflar";
           label3.Text = "Bütün Sınıflar";
           label4.Text = "Bütün Sınıflar";
           label5.Text = "Bütün Sınıflar";
           label6.Text = "Bütün Sınıflar";
           label7.Text = "Bütün Sınıflar";
           label8.Text = "Bütün Sınıflar";
           label9.Text = "Bütün Sınıflar";
           label10.Text = "Bütün Sınıflar";
           label11.Text = "Bütün Sınıflar";
           label12.Text = "Bütün Sınıflar";








           //En son eklenen boş satırı gizleme kodu
           dataGridView1.AllowUserToAddRows = false;

           // Sütun genişliklerini ayarlama

           dataGridView1.Columns[0].Width = 100;
           dataGridView1.Columns[1].Width = 200;
           dataGridView1.Columns[2].Width = 100;
           dataGridView1.Columns[3].Width = 50;
           dataGridView1.Columns[4].Width = 50;
           dataGridView1.Columns[5].Width = 50;
           dataGridView1.Columns[6].Width = 50;
           dataGridView1.Columns[7].Width = 50;
           dataGridView1.Columns[8].Width = 50;
           dataGridView1.Columns[9].Width = 50;
           dataGridView1.Columns[10].Width = 50;
           dataGridView1.Columns[11].Width = 50;
           dataGridView1.Columns[12].Width = 50;
           dataGridView1.Columns[13].Width = 50;
           dataGridView1.Columns[14].Width = 50;
           dataGridView1.Columns[15].Width = 100;
           dataGridView1.Columns[16].Width = 150;

           //Sütun adı değiştirme
           dataGridView1.Columns[0].HeaderText = "ÖğrNo";
           dataGridView1.Columns[1].HeaderText = "Ad-Soyad";
           dataGridView1.Columns[2].HeaderText = "Sınıf";
           dataGridView1.Columns[3].HeaderText = "1";
           dataGridView1.Columns[4].HeaderText = "2";
           dataGridView1.Columns[5].HeaderText = "3";
           dataGridView1.Columns[6].HeaderText = "4";
           dataGridView1.Columns[7].HeaderText = "5";
           dataGridView1.Columns[8].HeaderText = "6";
           dataGridView1.Columns[9].HeaderText = "7";
           dataGridView1.Columns[10].HeaderText = "8";
           dataGridView1.Columns[11].HeaderText = "9";
           dataGridView1.Columns[12].HeaderText = "10";
           dataGridView1.Columns[13].HeaderText = "11";
           dataGridView1.Columns[14].HeaderText = "12";
           dataGridView1.Columns[15].HeaderText = "Toplam";
           dataGridView1.Columns[16].HeaderText = "Derece";<<br mode="hold" />}

Private Void Total()
{

OleDbConnection baglan = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\Visual Studio Projects\\OZGUR_OKUL\\Classes.mdb");


int ogr = Convert.ToInt32(dataGridView1.CurrentRow.Cells[0].Value.ToString());

            int a1 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[3].Value);
            int a2 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[4].Value);
            int a3 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[5].Value);
            int a4 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[6].Value);
            int a5 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[7].Value);
            int a6 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[8].Value);
            int a7 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[9].Value);
            int a8 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[10].Value);
            int a9 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[11].Value);
            int a10 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[12].Value);
            int a11 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[13].Value);
            int a12 = Convert.ToInt32(dataGridView1.CurrentRow.Cells[14].Value);
            int atoplam = Convert.ToInt32(dataGridView1.CurrentRow.Cells[15].Value);

 baglan.Open();

        OleDbCommand guncelle = new OleDbCommand("UPDATE tarih SET 1sorupuan1 = @3, 1sorupuan2 =@4 , 1sorupuan3 =@5, 1sorupuan4 = @6, 1sorupuan5 = @7, 1sorupuan6 = @8, 1sorupuan7 = @9, 1sorupuan8 = @10, 1sorupuan9 = @11, 1sorupuan10 = @12, 1sorupuan11 = @13, 1sorupuan12 = @14, toplampuan1 = @15 where ogrno = '" + ogr + "'", baglan);
                    guncelle.Parameters.AddWithValue("@3", a1);
                    guncelle.Parameters.AddWithValue("@4", a2);
                    guncelle.Parameters.AddWithValue("@5", a3);
                    guncelle.Parameters.AddWithValue("@6", a4);
                    guncelle.Parameters.AddWithValue("@7", a5);
                    guncelle.Parameters.AddWithValue("@8", a6);
                    guncelle.Parameters.AddWithValue("@9", a7);
                    guncelle.Parameters.AddWithValue("@10", a8);
                    guncelle.Parameters.AddWithValue("@11", a9);
                    guncelle.Parameters.AddWithValue("@12", a10);
                    guncelle.Parameters.AddWithValue("@13", a11);
                    guncelle.Parameters.AddWithValue("@14", a12);
                    guncelle.Parameters.AddWithValue("@15", atoplam);
                    guncelle.ExecuteNonQuery();*/

            cb = new OleDbCommandBuilder(da);
            da.Update(dt);
}


private void Sinav1_Load(object sender, EventArgs e)
       {

   
               baglan.Open();

               da = new OleDbDataAdapter("Select [ogrno], [adsoyad], [sinif], [1sorupuan1], [1sorupuan2], [1sorupuan3], [1sorupuan4], [1sorupuan5], [1sorupuan6], [1sorupuan7], [1sorupuan8], [1sorupuan9], [1sorupuan10], [1sorupuan11], [1sorupuan12], [toplampuan1], [derece1] from tarih order by sinif";, baglan);
               dt = new DataTable();
               da.Fill(dt);
               dataGridView1.DataSource = dt;

}



              baglan.Close();