private void button1_Click(object sender, RoutedEventArgs e)
 {
     InputWord.Text = "";
     CodeArea.Text  = "";
     ParceCode.NavigateToString("<!DOCTYPE html ><html><meta http-equiv='Content-Type' content='text/html;charset=UTF-8'><head></head><body></body></html>");
     ErrorMsg.Text = "";
 }
        private void HighLightCode(List <string> Code, int Line)
        {
            var Alpha = string.Empty;
            var Betha = string.Empty;
            var Arrow = string.Empty;
            var Dummy = string.Empty;

            Dummy = "<!DOCTYPE html ><html><meta http-equiv='Content-Type' content='text/html;charset=UTF-8'><head></head><body><table width=146 cellspacing=0>";
            for (int i = 0; i < Code.Count; ++i)
            {
                var Rule = Code[i];
                var sk   = ("->").ToCharArray();
                var pos  = Rule.IndexOfAny(sk);
                if (pos < 0)
                {
                    pos = Rule.IndexOf("=>");
                }
                if (0 <= pos)
                {
                    try
                    {
                        Alpha = Rule.Substring(0, pos);
                    }
                    catch (System.Exception)
                    {
                        Alpha = string.Empty;
                    }
                    try
                    {
                        Arrow = Rule.Substring(pos, 2);
                    }
                    catch (System.Exception)
                    {
                        Alpha = string.Empty;
                    }
                    if (Arrow == "->")
                    {
                        Arrow = "&#8594";
                    }
                    else
                    {
                        Arrow = "&#8614;";
                    }
                    try
                    {
                        Betha = Rule.Substring(pos + 2, Rule.Length - pos - 2);
                    }
                    catch (System.Exception)
                    {
                        Betha = string.Empty;
                    }
                }
                Dummy += "<tr valign=top";
                if (i == Line)
                {
                    Dummy += " bgcolor=#e0f0e0";
                }
                Dummy += "><td align=right width=25>" + (i + 1) + ".&nbsp;</td><td align=right>" + Alpha + "</td><td align=center style=\"font-face:times new roman,serif;\">" + Arrow + "</td><td align=left>" + Betha + "&nbsp;&nbsp;</td></tr>";
            }
            Dummy += "</table></body></html>";
            ParceCode.NavigateToString(Dummy);
        }