Winform Textbox实现滚动条始终在最下面

private void textBox1_TextChanged(object sender, EventArgs e)
        {
            this.textBox1.SelectionStart = this.textBox1.Text.Length;
            this.textBox1.SelectionLength = 0;
            this.textBox1.ScrollToCaret();
        }

textBox1.Text=textBox1.Text+"内容"+Environment.NewLine;

textBox1.AppendText("内容"+Environment.NewLine);