C#用多线程避开TCP多次连接的问题

1.在做TCP客户端经常遇到开始连可以,后面就会卡起来 , 我的思路是新开一个线程,用来监听连接请求,另一个线程作为主线程去应付用户的操作.

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
using System.Threading;

namespace ConsoleApp3
{
    public class Message_01
    {
        public static int user_id;
        public static string user_name="";
        public static string nneed_send = "";
        public static string receive_recent="";
        public static Boolean status = true;
    }
    class Program
    {
       
        public static void connect()
        {
            IPAddress myIP = IPAddress.Parse("192.168.1.7");
            //构造一个TcpClient类对象,TCP客户端
            TcpClient client = new TcpClient();
            //与TCP服务器连接
            client.Connect(myIP, 7777);
            //创建网络流,获取数据流
            NetworkStream stream = client.GetStream();
            //读数据流对象
            StreamReader sr = new StreamReader(stream);
            //写数据流对象
            StreamWriter sw = new StreamWriter(stream);
            while (true)
            {
                if (Message_01.nneed_send.Equals(""))
                {
                    System.Threading.Thread.Sleep(15);
                }
                else
                {
                    try
                    {
                        string input0 = Message_01.nneed_send;
                        string[] sArray = Regex.Split(input0, " ", RegexOptions.IgnoreCase);
                        if (sArray[0].Equals("login"))
                        {
                            input0 = sArray[0] + " " + Md5_Tools("Apache" + sArray[1]);
                        }
                        Console.WriteLine(input0);
                        string input = String2Unicode(input0);
                        char[] chars = input.ToCharArray();
                        byte[] bytes = new byte[chars.Length];
                        for (int i = 0; i < chars.Length; i++)
                        {
                            int c = (int)chars[i];
                            bytes[i] = (byte)c;
                        }
                        Encoding Encoding_GB2312 = Encoding.GetEncoding("GB2312");
                        string str_converted = Encoding_GB2312.GetString(bytes);
                        sw.WriteLine(str_converted);
                        sw.Flush();             //刷新流
                        Message_01.receive_recent=sr.ReadLine();
                        Message_01.nneed_send = "";
                        

                    }
                    catch (IOException e)
                    {
                        /*无论如何都要将send清零*/
                        Message_01.nneed_send = "";
                        Message_01.status = false;/*判断执行是否出现错误*/
                    }
                }
            }            
        }
        public static string String2Unicode(string source)
        {
            byte[] bytes = Encoding.Unicode.GetBytes(source);
            StringBuilder stringBuilder = new StringBuilder();
            for (int i = 0; i < bytes.Length; i += 2)
            {
                stringBuilder.AppendFormat("\\u{0}{1}", bytes[i + 1].ToString("x").PadLeft(2, '0'), bytes[i].ToString("x").PadLeft(2, '0'));
            }
            return stringBuilder.ToString();
        }

        public static string Md5_Tools(string source)
        {

            //创建MD5实例
            MD5 md5 = MD5.Create();
            //计算哈希值
            byte[] result = md5.ComputeHash(Encoding.Default.GetBytes(source));
            string re = "";
            //历遍result的值
            for (int i = 0; i < result.Length; i++)
            {
                re += result[i].ToString("X2");
            }
            return re;

        }
    }
    public class ChatTestt
    {
        static void Main(string[] args)
        {

            Thread thread = new Thread(new ThreadStart(Program.connect));
            thread.Start();
            while (true)
            {
                string a = Console.ReadLine();
                Message_01.nneed_send = a;
                System.Threading.Thread.Sleep(120);
                var b = Message_01.receive_recent;
                
                Console.WriteLine(b);
            }
        }
    }
}