How to move a horizontalScrollBar which belong to a richTextBox

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            pp();
        }

        private void pp()
        {
            hScrollBar1.Value = 50;//<--- No Error

            // Property WordWrap is False for the next HScroll
            this.richTextBox1.HScrollBar.Value = 50;// <--- Error
            richTextBox1.HScroll.Value = 50;//<- Error Value not 
      //member 
        }

    }
}