public partial class TxtLine : TextBox

    {

        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]

        static extern IntPtr LoadLibrary(string lpFileName);

        public TxtLine()

        {

            InitializeComponent();

            this.Multiline = true;

            this.Width = 100;

            this.Height = 16;

            this.BorderStyle = BorderStyle.None;

            this.TextAlign = HorizontalAlignment.Center;

        }

        public string DataField

        { get; set; }

        public string Description

        { get; set; }

        private Color _linecolor = Color.Black;

        public Color LineColor

        {

            get

            {

                return this._linecolor;

            }

            set

            {

                this._linecolor = value;

                this.Invalidate();

            }

        }

        private const int WM_PAINT = 0xF;

        protected override void WndProc(ref Message m)

        {

            base.WndProc(ref m);

            if (m.Msg == WM_PAINT)

            {

                DrawLine();

            }

        }

        private void DrawLine()

        {

            Graphics g = this.CreateGraphics();

            using (Pen p = new Pen(this._linecolor))

            {

                g.DrawLine(p, 0, this.Height - 1, this.Width, this.Height - 1);

            }

        }

        protected override void OnPaint(PaintEventArgs pe)

        {

            base.OnPaint(pe);

        }

        protected override CreateParams CreateParams

        {

            get

            {

                CreateParams prams = base.CreateParams;

                if (LoadLibrary("msftedit.dll") != IntPtr.Zero)

                {

                    prams.ExStyle |= 0x020;

                    prams.ClassName = "RICHEDIT50W";

                }

                return prams;

            }

        }

    }