WinApp C# อยากทราบว่า "&H" ใน vb มันคืออะไรรึครับ (Chr(Val("&H" และ Convert.ToChar(Convert.ToDouble("&H" )

Public Shared Function ParseLink(Optional ByVal url As String = "") As String
        Dim i As Integer

        For i = 1 To Len(url) - 1
            If Mid(url, i, 1) = "%" Then
                url = url.Replace(url.Substring(i - 1, 3), Chr(Val("&H" + url.Substring(i, 2))))
            End If

        Next
        ParseLink = url
    End Function

public static class ParseLink
    {
        public static string ToStrings(string url)
        {
            string _url = url;
            int _index = 1;
            for (int i = 1; i < _url.Length - 1; i++)
            {
                if (_url.Substring(i, 1) == "%")
                {
                    if (_index == 1)
                    {
                        _url =  _url.Replace(_url.Substring(i, 3), "//")  ;
                    }
                    else
                    {
                        _url = _url.Replace(_url.Substring(i, 3), "");
                    }
                    _index++;
                }
            }
            return _url;
        }
    }

public static class clsYoutube
    {
    public static string strLoad = @"(?:url=(.*?)\\.*?type(.*?)\\.*?quality(.*?)\\)";
       public static string getVedioName(string url)
    {
             return new System.Text.RegularExpressions.Regex("(?:\"title:\"(.*?)\")").Match(GetPage(url)).Groups[1].Value;
    }

    public static string  ParseLink(string url = "")
     {
        string _url = url;
        for(int i = 1;i<_url.Length-1;i++)
        {
            if(_url.Substring(i,1) == "%")
            {
                _url = _url.Replace(_url.Substring(i, 3), Convert.ToChar(int.Parse(_url.Substring(i + 1, 2).Trim(), System.Globalization.NumberStyles.HexNumber)).ToString());
            }
        }
       return _url;
     }

    public static string GetBetween(string sSea , string Sstart , string sStop)
    {
        return new System.Text.RegularExpressions.Regex("(?:" + Sstart + "(.*?)" + sStop + ")").Match(sSea.Trim()).Groups[1].Value;
    }
    public static string getSectionLoad(string url)
    {
       return new System.Text.RegularExpressions.Regex("ytplayer.config =(.*?);</script>").Match(GetPage(url.Trim())).Groups[1].Value;
    }
    public static string GetPage(string url)
         {
             string html = "";
             try
             {
                 System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url.Trim());
                 System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
                 System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream());
                 html = sr.ReadToEnd();
                 sr.Close();
                 response.Close();
             }
             catch { }
             return html;
         }
    }

private void Button1_Click(object sender, EventArgs e)
        {
            DataGridView1.Rows.Clear();
            string strSection = clsYoutube.getSectionLoad(textBox1.Text);
            foreach(System.Text.RegularExpressions.Match _match in new  System.Text.RegularExpressions.Regex(clsYoutube.strLoad).Matches(strSection))
            {
                DataGridView1.Rows.Add( clsYoutube.ParseLink(_match.Groups[1].Value), clsYoutube.ParseLink(_match.Groups[2].Value), clsYoutube.ParseLink(_match.Groups[3].Value));

            }
            this.Text = clsYoutube.getVedioName(textBox1.Text);
        }