```
private void button1_Click(object sender, EventArgs e)
{
    t = new Thread(new ParameterizedThreadStart(startRequest));
    t.Start(textBox1);
}

void startRequest(object textBox1)
{
    textBox1.Text = "hello";
}

```

here I get an error that textBox1 doesn't have a property Text, in the main thread its all okay, but in the new thread I get an error ,how to fix this?