C# server in window and C client in linux

I wrote C# server in window and C client in Linux.

my c# server is

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 System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Timers;
using System.Drawing.Imaging;


namespace server_window
{
    public partial class Form1 : Form
    {
        Socket m_mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        IPEndPoint iplocal = new IPEndPoint(IPAddress.Any, 1234);
        Socket client;
        IPEndPoint newclient;
        public Form1()
        {
            InitializeComponent();
            BW_Connection.RunWorkerAsync();
        }
      
        private void BW_Connection_DoWork(object sender, DoWorkEventArgs e)
        {
            m_mainSocket.Bind(iplocal);
            m_mainSocket.Listen(4);
            client = m_mainSocket.Accept();
            newclient = (IPEndPoint)client.RemoteEndPoint;
            this.Invoke(new MethodInvoker(delegate { TB_text.Text = "Client connected..."; }));
        }
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            client.Close();
            
        }
    }
}

my C client program iin linux is

#include <sys/socket.h>  //for socket(), connect(), sendto() and recvform()
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>  // for printf() and fprintf()
#include <string.h>  //for memset()
#include <stdlib.h>   //for atoi() and exit()
#include <unistd.h>  //for close()
#include <errno.h>
#include <arpa/inet.h>  //for sockaddr_in and inet_addr()
 

#define SERVERPORT 1234 

int main ( )                      
{
        int sockfd, n;
        struct sockaddr_in serv_addr;
        struct hostent *serverINFO;
        
        char buffer[256];
        char hostname[1024];
        //struct hostent* h;
        gethostname(hostname, sizeof(hostname));
        serverINFO = gethostbyname(hostname);
        
        if(serverINFO == NULL)
        {
                printf("Problem interpreting host\n");
                return 1;  
        }
        sockfd = socket(AF_INET, SOCK_STREAM, 0);
        
        if (sockfd < 0)
                {
                        printf("Cannot create socket\n");
                        return 1;
                }
        serv_addr.sin_family = serverINFO ->h_addrtype;
        memcpy((char *) &serv_addr.sin_addr, serverINFO->h_addr_list[0], serverINFO->h_length);
        //serv_addr.sinport = htons(SERVERPORT);
        //bzero((char *) &serv_addr, sizeof(serv_addr));
        //serv_addr.sin_family = AF_INET;
        //memcpy(&serv_addr.sin_addr, server->h_addr, server->h_length);
        //bcopy((char *)server->h_addr,(char *)&serv_addr.sin_addr.s_addr,server->h_length);
        serv_addr.sin_port = htons (SERVERPORT);
        
        if(connect(sockfd, (struct sockaddr *)&serv_addr, sizeof (serv_addr)) < 0) 
                {
                        printf("Cannot connect\n");
                        return 1;
                }
        printf("Please enter the message: ");
        bzero(buffer, 256);
        fgets(buffer,255,stdin);
        n = write(sockfd, buffer, strlen(buffer));
        
        if (n < 0)
                printf ("ERROR writing to socket");
        bzero(buffer, 256);
        n = read (sockfd, buffer, 255);
        
        if (n < 0)   
                printf ("ERROR reading from socket");
        printf("here we are %s\n", buffer);
        close(sockfd);
}

I run each program in one PC. I used cross cable to connect both pc. But when i run both program, the client terminal showed that "cannot connect". :(.. how can i get the connection between these two? if my code is wrong, pls kindly guide me. thanks a lot