C#

using (var sqlConn = new SqlConnection("..."))
using (var sqlCmd = new SqlCommand("SELECT p.pcode, p.pdesc, b.brand, c.category, p.price, p.qty FROM tblProduct as p inner join tblBrand as b on b.id = p.bid inner join tblCategory as c on c.id = p.cid where p.pdesc like @SearchProd + '%'", sqlConn))
{
    sqlCmd.Parameters.AddWithValue("@SearchProd", txtSearchProd.Text);
    
    sqlConn.Open();
    
    using (var sqlDR = sqlCmd.ExecuteReader(CommandBehavior.CloseConnection))
    {
        while (sqlDR.Read())
        {
            i++;
            dgvProduct.Rows.Add(i, sqlDR[0].ToString(), sqlDR[1].ToString(), sqlDR[2].ToString(), sqlDR[3].ToString(), sqlDR[4].ToString(), sqlDR[5].ToString());
        }
    }
}

When I try to execute the code Sir, there is no data displayed on my datagrid.

I also try the to run these query on my sqlserver.

SELECT p.pcode, p.pdesc, b.brand, c.category, p.price, p.qty 
FROM tblProduct 
as p inner join tblBrand 
as b on b.id = p.bid inner join tblCategory 
as c on c.id = p.cid 
where p.pdesc like '%'

but theres no data showed.

SELECT p.pcode, p.pdesc, b.brand, c.category, p.price, p.qty 
FROM tblProduct p
INNER JOIN tblBrand b
       ON b.id = p.bid
WHERE p.pdesc LIKE '%'

public class myclass2
    {
    public int Id { set; get; }
    public string Name { set; get; }
    public override string ToString()
        {
        return $"{Id}:{Name}";
        }
    }

myDataGridView.DataSource = mylist;
myDataGridView.Columns[1].HeaderText = "My other class";

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

using System.IO;

namespace Asychn_Server
{
    // State object for reading client data asynchronously  
    public class StateObject
    {
        // Client  socket.  
        public Socket workSocket = null;
        // Size of receive buffer.  
        public const int BufferSize = 1024;
        // Receive buffer.  
        public byte[] buffer = new byte[BufferSize];
        // Received data string.  
        public StringBuilder sb = new StringBuilder();
    }
    public class AsynchronousSocketListener
    {
        // Thread signal.  
        public static ManualResetEvent allDone = new ManualResetEvent(false);

        public AsynchronousSocketListener()
        {
        }

        public static void StartListening()
        {
            // Establish the local endpoint for the socket.  
            // The DNS name of the computer  
            // running the listener is "host.contoso.com".  
            IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
            IPAddress ipAddress = ipHostInfo.AddressList[0];
            IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);

            // Create a TCP/IP socket.  
            Socket listener = new Socket(ipAddress.AddressFamily,
                SocketType.Stream, ProtocolType.Tcp);

            // Bind the socket to the local endpoint and listen for incoming connections.  
            try
            {
                listener.Bind(localEndPoint);
                listener.Listen(100);

                while (true)
                {
                    // Set the event to nonsignaled state.  
                    allDone.Reset();

                    // Start an asynchronous socket to listen for connections.  
                    Console.WriteLine("Waiting for a connection...");
                    listener.BeginAccept(
                        new AsyncCallback(AcceptCallback),
                        listener);

                    // Wait until a connection is made before continuing.  
                    allDone.WaitOne();
                }

            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }

            Console.WriteLine("\nPress ENTER to continue...");
            Console.Read();

        }

        public static void AcceptCallback(IAsyncResult ar)
        {
            // Signal the main thread to continue.  
            allDone.Set();

            // Get the socket that handles the client request.  
            Socket listener = (Socket)ar.AsyncState;
            Socket handler = listener.EndAccept(ar);

            // Create the state object.  
            StateObject state = new StateObject();
            state.workSocket = handler;
            handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                new AsyncCallback(ReadCallback), state);
        }

        public static void ReadCallback(IAsyncResult ar)
        {
            String content = String.Empty;

            // Retrieve the state object and the handler socket  
            // from the asynchronous state object.  
            StateObject state = (StateObject)ar.AsyncState;
            Socket handler = state.workSocket;

            // Read data from the client socket.
            int bytesRead = handler.EndReceive(ar);

            if (bytesRead > 0)
            {
                // There  might be more data, so store the data received so far.  
                state.sb.Append(Encoding.ASCII.GetString(
                    state.buffer, 0, bytesRead));

                // Check for end-of-file tag. If it is not there, read
                // more data.  
                content = state.sb.ToString();

                log("Socket status : " + handler.Connected);
                log("From socket : " + content);
                // Echo the data back to the client.  
                Send(handler, content);
                log("Socket status : " + handler.Connected);
                //if (content.IndexOf("<EOF>") > -1)
                //{
                //    // All the data has been read from the
                //    // client. Display it on the console.  
                //    //Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
                //    //    content.Length, content);
                //    log("From socket : " + content);
                //    // Echo the data back to the client.  
                //    Send(handler, content);
                //}
                //else
                //{
                //    // Not all data received. Get more.  
                //    handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                //    new AsyncCallback(ReadCallback), state);
                //}
            }
        }

        private static void Send(Socket handler, String data)
        {
            // Convert the string data to byte data using ASCII encoding.  
            byte[] byteData = Encoding.ASCII.GetBytes(data);

            // Begin sending the data to the remote device.  
            handler.BeginSend(byteData, 0, byteData.Length, 0,
                new AsyncCallback(SendCallback), handler);
        }

        private static void SendCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.  
                Socket handler = (Socket)ar.AsyncState;

                // Complete sending the data to the remote device.  
                int bytesSent = handler.EndSend(ar);
                //Console.WriteLine("Sent {0} bytes to client.", bytesSent);
                  log("TO socket : " + bytesSent + " -As reply");
                log("Socket status send: " + handler.Connected);
                allDone.Set();
                //handler.Shutdown(SocketShutdown.Both);
                //handler.Close();
                log("Socket status send2: " + handler.Connected);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }

        public static int Main(String[] args)
        {
            StartListening();
            return 0;
        }

        public  static void log(string strLog)
        {
            StreamWriter log;
            FileStream fileStream = null;
            DirectoryInfo logDirInfo = null;
            FileInfo logFileInfo;

            string logFilePath = "C:\\Logs\\";
            logFilePath = logFilePath + "LogServer-" + System.DateTime.Today.ToString("MM-dd-yyyy") + "." + "txt";
            logFileInfo = new FileInfo(logFilePath);
            logDirInfo = new DirectoryInfo(logFileInfo.DirectoryName);
            if (!logDirInfo.Exists) logDirInfo.Create();
            if (!logFileInfo.Exists)
            {
                fileStream = logFileInfo.Create();
            }
            else
            {
                fileStream = new FileStream(logFilePath, FileMode.Append);
            }
            log = new StreamWriter(fileStream);
            log.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + ": " + strLog);
            log.Close();
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
//using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
//using System.Text;
using System.IO;

namespace Asynch_client_form_2
{
   
    public partial class Form1 : Form
    {
        // The port number for the remote device.  
        private const int port = 11000;

        // ManualResetEvent instances signal completion.  
        private static ManualResetEvent connectDone =
            new ManualResetEvent(false);
        private static ManualResetEvent sendDone =
            new ManualResetEvent(false);
        private static ManualResetEvent receiveDone =
            new ManualResetEvent(false);

        // The response from the remote device.  
        private static String response = String.Empty;
        private static Socket client;

        private void ConnectBtn_Click(object sender, EventArgs e)
        {
            try
            {
                // Establish the remote endpoint for the socket.  
                // The name of the
                // remote device is "host.contoso.com".  
                IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
                IPAddress ipAddress = ipHostInfo.AddressList[0];
                IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);

                // Create a TCP/IP socket.  
                //Socket client = new Socket(ipAddress.AddressFamily,
                //    SocketType.Stream, ProtocolType.Tcp);

                client = new Socket(ipAddress.AddressFamily,
                   SocketType.Stream, ProtocolType.Tcp);

                // Connect to the remote endpoint.  
                client.BeginConnect(remoteEP,
                    new AsyncCallback(ConnectCallback), client);
                connectDone.WaitOne();
/*
                // Send test data to the remote device.  
                Send(client, "This is a test<EOF>");
                sendDone.WaitOne();

                // Receive the response from the remote device.  
                Receive(client);
                receiveDone.WaitOne();
                MsgTextBox.Text = response;*/
            }
            catch (Exception ex)
            {
                ExceptionTextBox.Text = ex.Message;
            }
        }
        private void SendBtn_Click(object sender, EventArgs e)
        {
            try
            { 
            // Send test data to the remote device.  
             //Send(client, MsgTextBox.Text );
                Send(client, "MY message");
                sendDone.WaitOne();

            // Receive the response from the remote device.  
            Receive(client);
            // receiveDone.WaitOne();
            MsgTextBox.Text = response;
            }
            catch (Exception ex)
            {
                ExceptionTextBox.Text = ex.Message;
            }
        }
        private static void ConnectCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.  
                Socket client = (Socket)ar.AsyncState;

                // Complete the connection.  
                client.EndConnect(ar);

                /* Console.WriteLine("Socket connected to {0}",
                     client.RemoteEndPoint.ToString());*/

                // Signal that the connection has been made.  
                connectDone.Set();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }
        private void DisConnectBtn_Click(object sender, EventArgs e)
        {
            // Release the socket.  
            client.Shutdown(SocketShutdown.Both);
            client.Close();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }

        public Form1()
        {
            InitializeComponent();
        }
        private static void Receive(Socket client)
        {
            try
            {
                // Create the state object.  
                StateObject state = new StateObject();
                state.workSocket = client;

                // Begin receiving the data from the remote device.  
                client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                    new AsyncCallback(ReceiveCallback), state);
            }
            catch (Exception e)
            {
              log(e.ToString());
            }
        }

        private static void ReceiveCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the state object and the client socket
                // from the asynchronous state object.  
                StateObject state = (StateObject)ar.AsyncState;
                Socket client = state.workSocket;

                // Read data from the remote device.  
                int bytesRead = client.EndReceive(ar);

                if (bytesRead > 0)
                {
                    // There might be more data, so store the data received so far.  
                    state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

                    // Get the rest of the data.  
                    client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                        new AsyncCallback(ReceiveCallback), state);
                }
                else
                {
                    // All the data has arrived; put it in response.  
                    if (state.sb.Length > 1)
                    {
                        response = state.sb.ToString();
                        log("Reply : " + response);
                    }
                    // Signal that all bytes have been received.  
                    receiveDone.Set();
                }
            }
            catch (Exception e)
            {
               log(e.ToString());
            }
        }

        private static void Send(Socket client, String data)
        {
            // Convert the string data to byte data using ASCII encoding.  
            byte[] byteData = Encoding.ASCII.GetBytes(data);

            // Begin sending the data to the remote device.  
            client.BeginSend(byteData, 0, byteData.Length, 0,
                new AsyncCallback(SendCallback), client);
        }

        private static void SendCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.  
                Socket client = (Socket)ar.AsyncState;

                // Complete sending the data to the remote device.  
                int bytesSent = client.EndSend(ar);
               // Console.WriteLine("Sent {0} bytes to server.", bytesSent);

                // Signal that all bytes have been sent.  
                sendDone.Set();
            }
            catch (Exception e)
            {
               log (e.ToString());
            }
        }
        public static void log(string strLog)
        {
            StreamWriter log;
            FileStream fileStream = null;
            DirectoryInfo logDirInfo = null;
            FileInfo logFileInfo;

            string logFilePath = "C:\\Logs\\";
            logFilePath = logFilePath + "LogClient-" + System.DateTime.Today.ToString("MM-dd-yyyy") + "." + "txt";
            logFileInfo = new FileInfo(logFilePath);
            logDirInfo = new DirectoryInfo(logFileInfo.DirectoryName);
            if (!logDirInfo.Exists) logDirInfo.Create();
            if (!logFileInfo.Exists)
            {
                fileStream = logFileInfo.Create();
            }
            else
            {
                fileStream = new FileStream(logFilePath, FileMode.Append);
            }
            log = new StreamWriter(fileStream);
            log.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + ": " + strLog);
            log.Close();
        }
    }
}

public string LabelText
    {
    get
        {
        return MyLabel.Text;
        }
    set
        {
        MyLabel.Text = value;
        }
    }

Crazy Joe Devola wrote:

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]

DesignerSerializationVisibilityAttribute Class (System.ComponentModel) | Microsoft Docs[^]

With the DesignerSerializationVisibilityAttribute, you can indicate whether the value for a property is Visible, and should be persisted in initialization code, Hidden, and should not be persisted in initialization code, or consists of Content, which should have initialization code generated for each public, not hidden property of the object assigned to the property.