I’m writing a server for creating an online chat in a WindowsFormsApp and encountered an error in ReceiveAsync and SendAsync. How can I fix it?

The issues start with trying to pass an argument into ReceiveAsync and SendAsync, resulting in an error about invalid arguments.

Server.cs

using System;
using System.Net;
using System.Net.Sockets;
using System.Security.Policy;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

public class HostInformationFetcherServer
{
    public async Task<IPHostEntry> GetHostEntryAsync()
    {
        try
        {

            string hostName = Dns.GetHostName();


            IPHostEntry ipEntry = await Dns.GetHostEntryAsync(hostName);

            IPAddress ip = ipEntry.AddressList[0];

            //connects the server socket to client socket
            IPEndPoint iPEndPoint = new IPEndPoint(ip, 1234);

            Socket server = new Socket(
            iPEndPoint.AddressFamily,
            SocketType.Stream,
            ProtocolType.Tcp
            );

            server.Bind(iPEndPoint);
            server.Listen(10);
            Console.WriteLine("Server started Listening on port: 1234");

            var handler = await server.AcceptAsync();

            while (true)
            {

                byte[] buffer = new byte[1024];
                SocketAsyncEventArgs args;

                //var received = await handler.ReceiveAsync(new ArraySegment<byte>, buffer);

                var received = await handler.ReceiveAsync(buffer, SocketFlags.None);   /*ERROR*/

                //convert bytes to string message
                var messageString = Encoding.UTF8.GetString(buffer, 0, received);

                if (messageString != null)
                {

                    Console.WriteLine("Message from client: {0}", messageString);

                    var response = "Message Received!";

                    var responseByte = Encoding.UTF8.GetBytes(response);

                    await handler.SendAsync(responseByte, SocketFlags.None);  /*ERROR*/
                }
            }
        }
        catch (System.Exception ex)
        {
          
            Console.WriteLine($"An error occurred: {ex.Message}");
            return null;
        }
    }
}

Client.cs

using System;
using System.Net;
using System.Net.Sockets;
using System.Security.Policy;
using System.Text;
using System.Threading.Tasks;

//Server code

//info about our localhost -- includes the ip address
public class HostInformationFetcherClient
{
    public async Task<IPHostEntry> GetHostEntryAsync()
    {
        try
        {

            string hostName = Dns.GetHostName();

            IPHostEntry ipEntry = await Dns.GetHostEntryAsync(hostName);

            IPAddress ip = ipEntry.AddressList[0];

            //connects the server socket to client socket
            IPEndPoint iPEndPoint = new IPEndPoint(ip, 1234);
            Socket client = new Socket(
            iPEndPoint.AddressFamily,
            SocketType.Stream,
            ProtocolType.Tcp
            );

            await client.ConnectAsync(iPEndPoint);

            while (true)
            {

                Console.Write("Send A Message:");
                var message = Console.ReadLine();

                //convert the string message to bytes message
                var messageBytes = Encoding.UTF8.GetBytes(message);


                //sends the message to the server
                await client.SendAsync(messageBytes, SocketFlags.None);  /*ERROR*/

                var buffer = new byte[1024];

                var received = await client.ReceiveAsync(buffer, SocketFlags.None);  /*ERROR*/
            }
        }
        catch (System.Exception ex)
        {
           
            Console.WriteLine($"An error occurred: {ex.Message}");
            return null;
        }
    }
}

I tried to find out what types of data are used for ReceiveAsync and SendAsync.