delegate void SetTextCallback(string text);
public Form1()
        {
            InitializeComponent();
        }
/// <summary>
/// 利用委托设置 文本框内容
/// </summary>
/// <param name="text"></param>
        public void SetText(string text)
        {
if (this.textBox1.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
this.Invoke(d, new object[] { text });
            }
else
            {
this.textBox1.Text = this.textBox1.Text + "\r\n" + text;
            }
        }

private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            Thread[] thd = new Thread[500];
int intI = 0;
for (intI = 0; intI < 50; intI++)
            {
                thd[intI] = new Thread(new ParameterizedThreadStart(thdText));
                thd[intI].Name = " Thread" + intI.ToString();
                thd[intI].IsBackground = true;
                thd[intI].Start(intI);
            }
        }
/// <summary>
/// 线程调用的方法
/// </summary>
/// <param name="obj"></param>
        private void thdText(object obj)
        {
            oper op = new oper();
int intI = Convert.ToInt32(obj);
            SetText(op.addition());
        }

    public class oper
    {
private static object obj = new object();

private static Single slgTotal;

public string addition()
        {
lock (obj)
            {
int intI = 0;
                slgTotal = 0;
for (intI = 0; intI <= 50; intI++)
                {
                    slgTotal = slgTotal + intI;
                    Thread.Sleep(5);
                }

return slgTotal.ToString() + " thread:" + Thread.CurrentThread.Name;
            }
        }
    }

    public class oper
    {
private static object obj = new object();

private static Single slgTotal;

public string addition()
        {
lock (this)
            {
int intI = 0;
                slgTotal = 0;
for (intI = 0; intI <= 50; intI++)
                {
                    slgTotal = slgTotal + intI;
                    Thread.Sleep(5);
                }

return slgTotal.ToString() + " thread:" + Thread.CurrentThread.Name;
            }
        }
    }

    public class oper
    {
private object obj = new object();

private static Single slgTotal;

public string addition()
        {
lock (obj)
            {
int intI = 0;
                slgTotal = 0;
for (intI = 0; intI <= 50; intI++)
                {
                    slgTotal = slgTotal + intI;
                    Thread.Sleep(5);
                }

return slgTotal.ToString() + " thread:" + Thread.CurrentThread.Name;
            }
        }
    }