System.Web.UI.WebControls.DetailsView does not contain a definition for Cells

Cant understand the error .. i am refering this link of gridview for my requirment For DetailsView what is the mistak .. ???     Error 18 'System.Web.UI.WebControls.DetailsView' does not contain a definition for 'Cells' and no extension method 'Cells' accepting a first argument of type  'System.Web.UI.WebControls.DetailsView' could be found (are you missing a using directive or an assembly reference?)  

   protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                LoadData();
            }
        }

        private void LoadData()
        {

            string query = @"SELECT ID,Name,Emp_No,Job_Title,Nationality,Administration,Section,Another_job,health_no,Exp_Date,National_ID,serial_no,reference,confirm_rcrd,arabic_name,arabic_jobtitle FROM KSMCemp_data";

            SqlDataAdapter da = new SqlDataAdapter(query, con);
            DataTable table = new DataTable();
            da.Fill(table);

            GridView2.DataSource = table;
            GridView2.DataBind();
            
        }
        
        public void chkStatus_OnCheckedChanged(object sender, EventArgs e)
        {
            CheckBox chkStatus = (CheckBox)sender;
            DetailsView row = (DetailsView)chkStatus.NamingContainer;


            string cid = row.Cells[1].Text;                              <<--- ERROR 
            bool status = chkStatus.Checked;


            
            string query = "UPDATE KSMCemp_data SET confirm_rcrd = @confirm_rcrd WHERE ID = @ID";

           
            SqlCommand com = new SqlCommand(query, con);


            com.Parameters.Add("@confirm_rcrd", SqlDbType.Bit).Value = status;

            com.Parameters.Add("@ID", SqlDbType.Int).Value = cid;


            con.Open();
            com.ExecuteNonQuery();
            con.Close();

            LoadData();
            
        }

http://www.ezzylearning.com/tutorial.aspx?tid=5187857&q=using-checkbox-in-asp-net-gridview-control