c#中多线程编程的实力

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.IO;

。。。。

 private void button1_Click(object sender, EventArgs e)
        {
            //立即转换
            Thread th1 = new Thread(new ThreadStart(threading_test_01));
           th1.Start();

        }

///////////////////////////////////////////////////////////////////////////////
        //多线程测试函数
        ///////////////////////////////////////////////////////////////////////////////
        public void threading_test_01()
        {
            for (int i = 0; i < 1000; i++)
            {
                 SetTextBoxValue(i.ToString());
                
            }
        }

        ///////////////////////////////////////////////////////////////////////////////
        //以下为多线程赋值textbox1的类
        ///////////////////////////////////////////////////////////////////////////////
       private delegate void CallSetTextValue();
        //通过委托调用
        void SetTextBoxValue(string fi)
        {
            TextBoxSetValue tbsv = new TextBoxSetValue(this.textBox1, fi);
            if (tbsv.TextBox.InvokeRequired)
            {
                CallSetTextValue call = new CallSetTextValue(tbsv.SetText);
                tbsv.TextBox.Invoke(call);              
            }
            else
            {
                tbsv.SetText();
            }
        }

        class TextBoxSetValue
        {
            private TextBox _TextBox;
            private string _Value;

            public TextBoxSetValue(TextBox TxtBox, String Value)
            {
                _TextBox = TxtBox;
                _Value = Value;
            }

            public void SetText()
            {
                _TextBox.Text = _Value;
            }


            public TextBox TextBox {
                set { _TextBox = value; }
                get { return _TextBox; }
            }          
        }