C#

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    private const int WM_HSCROLL = 276; // Horizontal scroll<br />
    private const int WM_VSCROLL = 277; // Vertical scroll<br />
    private const int SB_LINEUP = 0; // Scrolls one line up<br />
    private const int SB_LINELEFT = 0;// Scrolls one cell left<br />
    private const int SB_LINEDOWN = 1; // Scrolls one line down<br />
    private const int SB_LINERIGHT = 1;// Scrolls one cell right<br />
    private const int SB_PAGEUP = 2; // Scrolls one page up<br />
    private const int SB_PAGELEFT = 2;// Scrolls one page left<br />
    private const int SB_PAGEDOWN = 3; // Scrolls one page down<br />
    private const int SB_PAGERIGTH = 3; // Scrolls one page right<br />
    private const int SB_PAGETOP = 6; // Scrolls to the upper left<br />
    private const int SB_LEFT = 6; // Scrolls to the left<br />
    private const int SB_PAGEBOTTOM = 7; // Scrolls to the upper right<br />
    private const int SB_RIGHT = 7; // Scrolls to the right<br />
    private const int SB_ENDSCROLL = 8; // Ends scroll<br />
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    [DllImport("user32.dll", CharSet=CharSet.Auto)]<br />
    private static extern int SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam);<br />
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    private void btnScrollLeft_Click(object sender, System.EventArgs e)<br />
    {<br />
      SendMessage(this.textBox.Handle, WM_HSCROLL, (IntPtr)SB_LINELEFT, IntPtr.Zero);<br />
    }<br />