Update Check box from SQL server using c#

SQL Server DB I am new to c# and SQL server... I insert value 1 if a checkbox is selected other insert value 0 in SQL server and added text box for id. If I type id in the text box and click the update button the 1vvalue from SQL server update the checkbox as selected help me to solve the problem

private void add_recipe_Click(object sender, EventArgs e)
        {
            string engine1 = "";
            string engine2 = "";
            string engine3 = "";
            if(e1.Checked)
            {
                engine1 = "1";
            }
            else
            {
                engine1="0";
            }
            if (e2.Checked)
            {
                engine2 = "1";
            }
            else
            {
                engine2 = "0";
            }
            if (e3.Checked)
            {
                engine3 = "1";
            }
            else
            {
                engine3 = "0";
            }
            con.Open();
            SqlCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "insert into Table_3 (id,part1,part2,part3) values('" + textBox1.Text+"','"+engine1+"','"+engine2+"','"+engine3+"') ";
            cmd.ExecuteNonQuery();
            con.Close();
            dataupdate();
            MessageBox.Show("Recipe Inserted");
        }
        public void dataupdate()
        {
            con.Open();
            SqlCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "SELECT id from Table_3 ";
            cmd.ExecuteNonQuery();
            DataTable dt = new DataTable();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);
            dataGridView1.DataSource = dt;
            dataGridView1.ScrollBars = ScrollBars.None;
            con.Close();
        }