带有C#严重性代码的Winsock错误:名称“DataInput”在当前上下文中不存在

我是用c#编码的新手,我的项目是使用Winsock控件连接服务器和客户端。我正在做这个节目 http://www.go4expert.com/articles/winsock-c-sharp-t3312/ 连接服务器和客户端。

形式: enter image description here

代码:

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;

namespace Winsock
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.w1.Error += new AxMSWinsockLib.DMSWinsockControlEvents_ErrorEventHandler(this.w1_Error);
            this.w1.ConnectEvent += new System.EventHandler(this.w1_ConnectEvent);
            this.w1.DataArrival += new AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEventHandler(this.w1_DataArrival);
        }
        Boolean isConnect = false;
        private void w1_ConnectEvent(object sender, EventArgs e)
        {
            DataInput.Text += "\n - Connect Event : " + w1.RemoteHostIP;
            isConnect = true;
        }

        public void w1_Error(object sender, AxMSWinsockLib.DMSWinsockControlEvents_ErrorEvent e)
        {
            DataInput.Text += "\n- Error : " + e.description;
            isConnect = false;
        }

        private void w1_DataArrival(object sender, AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEvent e)
        {
            String data = "";      
            Object dat = (object)data;
            w1.GetData(ref dat);
            data = (String)dat;
            DataInput.Text += "\nServer - " + w1.RemoteHostIP + " : " + data;
        }

        private void send_Click(object sender, EventArgs e)
        {
            try
            {
                if (isConnect)
                {
                    w1.SendData(SendText.Text);

                    DataInput.Text += "\nClent(You ;-) : " + SendText.Text;

                    SendText.Text = "";
                }
                else
                    MessageBox.Show("You are not connect to any host ");
            }
            catch (AxMSWinsockLib.AxWinsock.InvalidActiveXStateException g)
            {
                DataInput.Text += "\n" + g.ToString();
            }
            catch (Exception ex)
            {
                DataInput.Text += "\n" + ex.Message;
            }
        }

        private void disconnect_Click(object sender, EventArgs e)
        {
            w1.Close();
            w1.LocalPort = Int32.Parse(portText.Text);
            w1.Listen();
            DataInput.Text += "\n - Disconnected";
        }

        private void Connect_Click(object sender, EventArgs e)
        {
            try
            {
                w1.Close(); 
                w1.Connect(IPText.Text, portText.Text);

            }
            catch (System.Windows.Forms.AxHost.InvalidActiveXStateException g)
            {
                DataInput.Text += "\n" + g.ToString();
            }
        }

        private void w1_ConnectionRequest(object sender, AxMSWinsockLib.DMSWinsockControlEvents_ConnectionRequestEvent e)
        {
            if (isConnect == true)
            {
                w1.Close();
            }
            w1.Accept(e.requestID);
            isConnect = true;
            DataInput.Text += "\n - Client Connected :" + w1.RemoteHostIP;
        }
    }
}

错误

当前上下文中不存在名称“DataInput”

我似乎无法通过搜索网页找到解决此问题的方法请帮助我:(