1-) C# - sql datagridden verileri çekme

int secilen = dataGridView1.SelectedCells[0].RowIndex;

            Txtİd.Text = dataGridView1.Rows[secilen].Cells[0].Value.ToString();

//Txtİd.Text = dataGridView1.Rows[secilen]["yazar"];

            TxtAd.Text = dataGridView1.Rows[secilen].Cells[1].Value.ToString();

            TxtSoyad.Text = dataGridView1.Rows[secilen].Cells[2].Value.ToString();

            CmbSehir.Text = dataGridView1.Rows[secilen].Cells[3].Value.ToString();

            Mskmaas.Text = dataGridView1.Rows[secilen].Cells[4].Value.ToString();

            string dd = dataGridView1.Rows[secilen].Cells[5].Value.ToString();

            if (dd!="")

            {

                Boolean deger = Convert.ToBoolean(dd);

                if (deger == true)

                {

                    radioButton1.Checked = true;

                }

                else

                {

                    radioButton2.Checked = true;

                }

            }

            else

            {

                radioButton1.Checked = true;

            }

            TxtMeslek.Text = dataGridView1.Rows[secilen].Cells[6].Value.ToString();