unabele to retreieve combobox datamember value

Hi experts

I want to access data from two tables client_mst and client_notes

I have a combobox in which i want to set displaymember as  client_mst.client_name and DispalayValue as client_mst.client_id

depending on the combobox SelectedValue  i want to display the values in the datagrid view as


@"select client_notes.date,client_notes.message from client_notes where client_notes.client_id =" (int)clNamecomboBox.SelectedValue ;


Here i can't retreieve combobox selectedvalue  clNamecomboBox.SelectedValue is not showing any value

and i'm not sure whether to use two dataadapters for two sql statements

pls help me.
Thanks.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MySql.Data;
using MySql.Data.MySqlClient;
 
namespace Easypeasy_Office_Management
{
    public partial class easypeasyForm : Form
    {
        public easypeasyForm()
        {
            InitializeComponent();
            
        }
 
 
        private void btnNotes_Click(object sender, EventArgs e)
        {
            notesPanel.Enabled = true;
            notesPanel.Visible = true;
            string connString = @"server=localhost;database=abc;user id=root;password=kodanda;";
            string sql = @"select  client_name,client_no,notes_message as Notes,notes_date as `Date` from client_mst,client_notes  where client_mst.client_id=client_notes.client_id";
            MySqlConnection conn = null;
           
            try
            {
                conn = new MySqlConnection(connString);
                conn.Open();
               
                MySqlDataAdapter dAdapter = new MySqlDataAdapter(sql, conn);
                MySqlCommandBuilder cBuilder = new MySqlCommandBuilder(dAdapter);
                DataTable dTable = new DataTable();
                dAdapter.Fill(dTable);
                BindingSource bSource = new BindingSource();
                bSource.DataSource = dTable;
               
                MessageBox.Show("demonstrating");
                MessageBox.Show(conn.Database);
                clNamecomboBox.DataSource = bSource;
                clNamecomboBox.DisplayMember = "client_name";
                clNamecomboBox.ValueMember = "client_mst.client_id";
                clNotextBox.Text = (string)clNamecomboBox.SelectedValue;
                dataGridViewNotes.DataSource = bSource;
                dAdapter.Update(dTable);
                
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error" + ex);
            }
            finally
            {
             
                conn.Close();
            }
 
        }
 
       
        
        
        
    }
}

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