/*-------------form1中----------------------------*/ 
Form2 f2 = new Form2();
//线程函数  
      public void ShowForm()
        {
            f2.ShowDialog();
        }    
//打开form2 
      private void button3_Click(object sender, EventArgs e)
        {
            ThreadStart Ts = new ThreadStart(ShowForm);
            Thread th = new Thread(Ts);
            th.IsBackground = true;
            th.Start();
            //绑定委托事件
            DST = f2.setContent;
        }
//声明委托，用委托来实现线程间的数据传递
        public delegate void DelegateSetText(string T);
        public DelegateSetText DST;
//向form1中写入文本
 private void textBox1_KeyUp(object sender, KeyEventArgs e)
        {
            string text = textBox1.Text;
            //触发委托
            DST(text);
        }
/*---------------form2中--------------------------*/
 public void setContent(string T)
        {
             this.textBox1.Text = T;
        }