Save edited datagridview into SQL Server database C#

private void MDIParent1_Load(object sender, EventArgs e)

        {

            SqlConnection con = new SqlConnection("server=UNICO; Database = Jefes; Integrated Security= SSPI");

            SqlDataAdapter vj = new SqlDataAdapter("select * from VIEW_JEFE", con);

            SqlCommandBuilder builder = new SqlCommandBuilder(vj);

            con.Open();

            DataSet ds = new DataSet();

            ds.EnforceConstraints = false;

            vj.Fill(ds, "VIEW_JEFE");

            con.Close();

            DataGrid dg = new DataGrid();

            dg.DataSource = ds;

            dg.DataMember = "VIEW_JEFE";

            dataSetJefes.EnforceConstraints = false;

                        // TODO: This line of code loads data into the 'dataSetJefes.VIEW_JEFE' table. You can move, or remove it, as needed.

            this.vIEW_JEFETableAdapter.Fill(this.dataSetJefes.VIEW_JEFE);

        }

       

        private void button2_Click(object sender, EventArgs e)

        {

            

            for (int i = 0; i < dg.Rows.Count - 1; i++)

            {

                

                dg.Rows[i].Cells[35].Value = decimal.Parse(dg.Rows[i].Cells[9].Value.ToString()) / decimal.Parse(dg.Rows[i].Cells[10].Value.ToString()) * 100;

                if (decimal.Parse(dg.Rows[i].Cells[9].Value.ToString()) == 0 | decimal.Parse(dg.Rows[i].Cells[13].Value.ToString()) == 0)

                    dg.Rows[i].Cells[36].Value = 0;

                else

                    dg.Rows[i].Cells[36].Value = (decimal.Parse(dg.Rows[i].Cells[12].Value.ToString()) / decimal.Parse(dg.Rows[i].Cells[9].Value.ToString())) / (decimal.Parse(dg.Rows[i].Cells[13].Value.ToString()) / decimal.Parse(dg.Rows[i].Cells[10].Value.ToString())) * 100;

                dg.Rows[i].Cells[37].Value = ((decimal.Parse(dg.Rows[i].Cells[29].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[33].Value.ToString())) / (decimal.Parse(dg.Rows[i].Cells[9].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[12].Value.ToString()))) / ((decimal.Parse(dg.Rows[i].Cells[30].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[34].Value.ToString())) / (decimal.Parse(dg.Rows[i].Cells[10].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[13].Value.ToString()))) * 100;

                dg.Rows[i].Cells[38].Value = ((decimal.Parse(dg.Rows[i].Cells[9].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[19].Value.ToString())) / (decimal.Parse(dg.Rows[i].Cells[9].Value.ToString()))) / ((decimal.Parse(dg.Rows[i].Cells[11].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[20].Value.ToString())) / (decimal.Parse(dg.Rows[i].Cells[11].Value.ToString()))) * 100;

                decimal ec = 0;

                decimal eb = 0;

                ec = decimal.Parse(dg.Rows[i].Cells[25].Value.ToString()) / (decimal.Parse(dg.Rows[i].Cells[9].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[12].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[15].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[17].Value.ToString()));

                eb = decimal.Parse(dg.Rows[i].Cells[26].Value.ToString()) / (decimal.Parse(dg.Rows[i].Cells[11].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[14].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[16].Value.ToString()) + decimal.Parse(dg.Rows[i].Cells[18].Value.ToString()));

                dg.Rows[i].Cells[39].Value = ec / eb * 100;

            }

            

        }