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   protected override void OnMouseMove(MouseEventArgs e)        {            if (e.Button == MouseButtons.Left)            {                SetScroll();            }            base.OnMouseMove(e);        }        protected override bool ProcessCmdKey(ref Message m, Keys keyData)        {            if (keyData == Keys.Left || keyData == Keys.Right || keyData == Keys.Down || keyData == Keys.Up)            {                SetScroll();            }            return base.ProcessCmdKey(ref m, keyData);        }
        protected override void OnMouseWheel(MouseEventArgs e)        {            SetScroll();        }
        protected override void OnTextChanged(EventArgs e)        {            base.OnTextChanged(e);            SetScroll();        }        private void SetScroll()        {            if (AsyncScroll != null)            {                BeginInvoke(new Action(() =>                {                    int Pos = GetScrollPos(Handle, SB_VERT);                    AsyncScroll(Pos);                }));                GC.Collect();            }
        }

  public partial class NumTextBox : UserControl    {        const int SB_VERT = 1;        const int WM_VSCROLL = 0X0115;        const int SB_THUMBPOSITION = 4;        [DllImport("user32.dll")]        static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);        [DllImport("user32.dll")]        private static extern int SendMessage(IntPtr hWnd, int wMsg, IntPtr wParam, IntPtr lParam);        public override string Text        {            get { return txt_text.Text; }            set { txt_text.Text = value; }        }        public NumTextBox()        {            InitializeComponent();            txt_text.AsyncScroll += pos =>            {                SetScrollPos(txt_num.Handle, SB_VERT, (SB_THUMBPOSITION + 0x10000 * pos), true);                SendMessage(txt_num.Handle, WM_VSCROLL, (IntPtr)(SB_THUMBPOSITION + 0x10000 * pos), IntPtr.Zero);            };        }        protected override void OnLoad(EventArgs e)        {            base.OnLoad(e);            txt_num.BackColor = panel_split.BackColor = Color.WhiteSmoke;        }        private void txt_text_TextChanged(object sender, EventArgs e)        {            txt_num.Clear();            string[] lines = txt_text.Text.Split('\n');            string[] nums = new string[lines.Length];            for (int i = 1; i <= lines.Length; i++)            {                nums[i - 1] = i + "";            }            txt_num.Lines = nums;        }    }