遵循以下代码:

Follow the following coding:

lbx.Items.Add(tbx.Text);

将以上代码添加到按钮的click事件中.

Add the above code in your button''s click event.

尝试以下代码:

Try this code:

Private Sub button1_Click(sender As Object, e As EventArgs)
    listBox1.Items.Add(textBox1.Text)
End Sub