多线程中如何操作textBox?
public   partial   class   Main   :   Form
{
        public   Main()
        {
                InitializeComponent();
        }

        private   void   button1_Click(object   sender,   EventArgs   e)
        {
                Thread   tdTmp   =   new   Thread(new   ThreadStart(new   Hebf(ref   textBox1).test));
                tdTmp.Start();
                tdTmp.Join();
        }
}
class   Hebf
{
        TextBox   textBox_Main;
        public   Hebf(ref   TextBox   textBox_MainTmp)
        {
                this.textBox_Main   =   textBox_MainTmp;
        }
        public   void   test()
        {
                textBox_Main.Text   +=   "asad ";//这样出错
        }
}
不同的class里怎么操作？

------解决方案--------------------
change
Thread tdTmp = new Thread(new ThreadStart(new Hebf(ref textBox1).test));
to
Hebf hebf = new Hebf(ref textBox1);
Thread tdTmp = new Thread(new ThreadStart(hebf.test));
------解决方案--------------------
//这样测试看看

private void button1_Click(object sender, EventArgs e)
{
Thread tdTmp = new Thread(new ThreadStart(new Hebf(textBox1).test));
tdTmp.Start();
//tdTmp.Join();
}

class Hebf
{
TextBox textBox_Main;
public Hebf(TextBox textBox_MainTmp)
{
textBox_Main = textBox_MainTmp;
}

public void test()
{
textBox_Main.Invoke(new EventHandler(DoInvoke));
}
private void DoInvoke(object sender, EventArgs e)
{
textBox_Main.Text += "asad ";
}
}