WPF HTML Supported TextBlock

using System;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.Collections.Generic;

namespace QuickZip.MiniHtml2
{

    public class CurrentStateType
    {
        private List<HtmlTag> activeStyle = new List<HtmlTag>();
        private bool bold;
        private bool italic;
        private bool underline;
        private string hyperlink;

        public bool Bold { get { return bold; } }
        public bool Italic { get { return italic; } }
        public bool Underline { get { return underline; } }
        public string HyperLink { get { return hyperlink; } }

        public void UpdateStyle(HtmlTag aTag)
        {
            if (!aTag.IsEndTag)
                activeStyle.Add(aTag);
            else
                for (int i = activeStyle.Count - 1; i >= 0; i--)
                    if ('/' + activeStyle[i].Name == aTag.Name)
                    {
                        activeStyle.RemoveAt(i);
                        break;
                    }
            updateStyle();
        }


        private void updateStyle()
        {
            bold = false;
            italic = false;
            underline = false;
            hyperlink = "";

            foreach (HtmlTag aTag in activeStyle)
                switch (aTag.Name)
                {
                    case "b": bold = true; break;
                    case "i": italic = true; break;
                    case "u": underline = true; break;
                    case "a": if (aTag.Contains("href")) hyperlink = aTag["href"]; break;
                }
        }

        public CurrentStateType()
        {

        }



    }
	
}