c# socket小问题

我想做一个小程序用socket发送消息并接收，代码如下，但一直不成功，求教，谢谢

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.Sockets;

using System.Net;

using System.Threading;



namespace SendMessage

{

   

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            

        }



        private void button1_Click(object sender, EventArgs e)

        {

            Thread trsend = new Thread(new ThreadStart(sendmsg));

            trsend.Start();

            trsend.Abort();

            

        }

        private void sendmsg()

        {

            Socket sendsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Udp );

            sendsocket.Connect("127.0.0.1", 8000);

            byte[] bysend = Encoding.UTF8 .GetBytes(textBox1.Text);

            sendsocket.Send(bysend);

            sendsocket.Shutdown(SocketShutdown.Both);

            sendsocket.Close();

        }

        private void receivemsg()

        {

            Socket receivesocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Udp );

            IPEndPoint receiveip = new IPEndPoint(IPAddress.Parse ("127.0.0.1"), 8000);

            receivesocket.Bind(receiveip);

            receivesocket.Listen(20);

            try

            {

                while (true)

                {

                    Socket sockettmp = receivesocket.Accept();

                    byte[] buffer = new byte[sockettmp.ReceiveBufferSize];

                    if (receivesocket.Receive(buffer) > 0)

                    {

                        richTextBox1.Text += Encoding.UTF8.GetString(buffer) + Environment.NewLine;

                    }

                    else

                    {

                        Thread.Sleep(1000);

                    }

                }

            }

            catch(Exception ex)

            {

                MessageBox.Show (ex.Message);

            }

        }



        private void button2_Click(object sender, EventArgs e)

        {

            Thread trreceive = new Thread(new ThreadStart(receivemsg));

            trreceive.Start();

            

        }



       

        



       

        







    }

}

namespace SendMessage

{

    partial class Form1

    {

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        private System.ComponentModel.IContainer components = null;



        /// <summary>

        /// 清理所有正在使用的资源。

        /// </summary>

        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }



        #region Windows 窗体设计器生成的代码



        /// <summary>

        /// 设计器支持所需的方法 - 不要

        /// 使用代码编辑器修改此方法的内容。

        /// </summary>

        private void InitializeComponent()

        {

            this.button1 = new System.Windows.Forms.Button();

            this.richTextBox1 = new System.Windows.Forms.RichTextBox();

            this.textBox1 = new System.Windows.Forms.TextBox();

            this.button2 = new System.Windows.Forms.Button();

            this.SuspendLayout();

            // 

            // button1

            // 

            this.button1.Location = new System.Drawing.Point(12, 231);

            this.button1.Name = "button1";

            this.button1.Size = new System.Drawing.Size(75, 23);

            this.button1.TabIndex = 0;

            this.button1.Text = "button1";

            this.button1.UseVisualStyleBackColor = true;

            this.button1.Click += new System.EventHandler(this.button1_Click);

            // 

            // richTextBox1

            // 

            this.richTextBox1.Dock = System.Windows.Forms.DockStyle.Top;

            this.richTextBox1.Location = new System.Drawing.Point(0, 0);

            this.richTextBox1.Name = "richTextBox1";

            this.richTextBox1.Size = new System.Drawing.Size(292, 190);

            this.richTextBox1.TabIndex = 2;

            this.richTextBox1.Text = "";

            // 

            // textBox1

            // 

            this.textBox1.Location = new System.Drawing.Point(12, 204);

            this.textBox1.Name = "textBox1";

            this.textBox1.Size = new System.Drawing.Size(100, 21);

            this.textBox1.TabIndex = 3;

            // 

            // button2

            // 

            this.button2.Location = new System.Drawing.Point(150, 231);

            this.button2.Name = "button2";

            this.button2.Size = new System.Drawing.Size(75, 23);

            this.button2.TabIndex = 4;

            this.button2.Text = "button2";

            this.button2.UseVisualStyleBackColor = true;

            this.button2.Click += new System.EventHandler(this.button2_Click);

            // 

            // Form1

            // 

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.ClientSize = new System.Drawing.Size(292, 266);

            this.Controls.Add(this.button2);

            this.Controls.Add(this.textBox1);

            this.Controls.Add(this.richTextBox1);

            this.Controls.Add(this.button1);

            this.Name = "Form1";

            this.Text = "Form1";

            this.ResumeLayout(false);

            this.PerformLayout();



        }



        #endregion



        private System.Windows.Forms.Button button1;

        private System.Windows.Forms.RichTextBox richTextBox1;

        private System.Windows.Forms.TextBox textBox1;

        private System.Windows.Forms.Button button2;

    }

}

--------------------编程问答-------------------- 我先点击button2，然后才点击button1的 --------------------编程问答-------------------- 需要将UDP改为TCP；UDP协议是不用侦听的(listen) --------------------编程问答-------------------- http://topic.csdn.net/u/20100810/12/832a3cfa-09af-4c03-99d9-84e872a040f7.html --------------------编程问答-------------------- 你的监听代码在哪里？服务器端先要监听，客户端去连接，服务器接收到连接后Accept，此方法返回一个Socket，用那个Socket才能和客户端通信。 --------------------编程问答--------------------

引用 2 楼 windchenhonglong 的回复:

需要将UDP改为TCP；UDP协议是不用侦听的(listen)

改了还是不行啊 --------------------编程问答--------------------

引用 4 楼 ivy_zheng 的回复:

你的监听代码在哪里？服务器端先要监听，客户端去连接，服务器接收到连接后Accept，此方法返回一个Socket，用那个Socket才能和客户端通信。

过程基本就是这样 --------------------编程问答--------------------

            trsend.Start();

            trsend.Abort();

--------------------编程问答--------------------

            trsend.Start();

            trsend.Abort();

这是什么代码？ --------------------编程问答--------------------

引用 4 楼 ivy_zheng 的回复:

你的监听代码在哪里？服务器端先要监听，客户端去连接，服务器接收到连接后Accept，此方法返回一个Socket，用那个Socket才能和客户端通信。

能教一下怎么改吗？ --------------------编程问答-------------------- 7,8楼sp1234大神已经说的很清楚了，你把线程启动又销毁什么意思？ --------------------编程问答-------------------- trsend.Start();
trsend.Abort();

去掉后面句..没发送就直接中止了你 --------------------编程问答-------------------- http://www.albahari.com/threading/
http://msdn.microsoft.com/zh-tw/library/a9fyxz7d%28v=VS.80%29.aspx
看一下Thread怎麼執行 --------------------编程问答-------------------- 到网上找一段可以用的代码研究研究

或者照着书上来来写

补充：.NET技术 ,  C#