ช่วยดูโค้ด ดึงข้อมูลจากฐานข้อมูลส่ใน Combobox ที่อยู่ใน DataGridView ให้หน่อยค่ะ c#

public Form3()
        {
            InitializeComponent();
        }

        string cn = "Data Source=BPK_TRAINNING; Initial Catalog=test1; User ID=sa; Password=bpk$1234";
        DataSet ds = new DataSet();
        SqlDataAdapter da = new SqlDataAdapter();
        SqlConnection con = new SqlConnection();
        DataTable dtable = new DataTable();
        DataViewManager dvm = new DataViewManager();
 
        public string Par1;
        public string Par2;
       
        private void Form3_Load(object sender, EventArgs e)
        {

           
            string sql = "Select * from Q_Checkup";
            da = new SqlDataAdapter(sql, cn);
            ds = new DataSet();
            da.Fill(ds, "Table");
            dvm = new DataViewManager();
            dvm.DataSet = ds;

           
            DataGridViewComboBoxColumn col1 = new DataGridViewComboBoxColumn();
            col1.DataPropertyName = "AccountName";
            col1.DataSource = ds.Tables["Q_Checkup"];
            col1.ValueMember = "PEC_id";
            col1.DisplayMember = "RTC_Desc";
            
            
        
            col1.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            dataGridView1.Columns.Add(col1);

            dataGridView1.Rows.Add("pa_sex", "เพศ");

            dataGridView1.Rows.Add("PEC_weight", "น้ำหนัก");

         

        }
}