Simple code to convert ASPX page to ASPX User Control

Here is the simple code to convert ASPX page to ASPX user control

public class ConvertPageToUserControl
    {
        string _pageFileName = string.Empty;
        string _pagePath = string.Empty;
        StreamReader _pageRader = default(StreamReader);
        StreamWriter _ucWriter = default(StreamWriter);
       
        public string PageFileName
        {
            get
            { return _pageFileName; }
            set
            { _pageFileName = value; }
        }

        public string PageFilePath
        {
            get
            { return _pagePath; }
            set
            { _pagePath = value; }
        }

        string PageFile
        {
            get { return Path.Combine(_pagePath,_pageFileName); }
        }
        string UserControlName
        {
            get { return string.Format("{0}.ascx", _pageFileName.Split(".".ToCharArray())[0]); }
        }

        string UserControlFile
        {
            get { return Path.Combine(_pagePath, UserControlName); }
        }

        public void Convert()
        {
           
            ReadPageDoc();
            GetUCDoc();
            string _lineText = _pageRader.ReadLine();

            while (!_pageRader.EndOfStream)
            {
               
                if (_lineText.ToLower().IndexOf("<html") > -1 ||
                    (_lineText.ToLower().IndexOf("<body") > -1) ||
                    (_lineText.ToLower().IndexOf("<head") > -1) ||
                    (_lineText.ToLower().IndexOf("<title") > -1) ||
                    (_lineText.ToLower().IndexOf("<form") > -1) ||
                    _lineText.ToLower().IndexOf("</html") > -1 ||
                    (_lineText.ToLower().IndexOf("</body") > -1) ||
                    (_lineText.ToLower().IndexOf("</head") > -1) ||
                    (_lineText.ToLower().IndexOf("</title") > -1) ||
                    (_lineText.ToLower().IndexOf("</form") > -1) ||
                    (_lineText.ToUpper().IndexOf("<!DOCTYPE") > -1))
                {
                    _lineText = _pageRader.ReadLine();
                    continue;
                }
                else if (_lineText.ToLower().IndexOf("@ page") > -1)
                    _lineText = UpdatePageTag(_lineText);
                _ucWriter.WriteLine(_lineText);
                _lineText = _pageRader.ReadLine();
            }
            _ucWriter.Close();
            _pageRader.Close();
            StreamReader _pageCodeBehind = new StreamReader(PageFile + ".cs");
            StreamWriter _ucCodeBehind = new StreamWriter(UserControlFile + ".cs");
            while (!_pageCodeBehind.EndOfStream)
            {
                string LineText = string.Empty;
                LineText = _pageCodeBehind.ReadLine();
                LineText = LineText.Replace("System.Web.UI.Page", "System.Web.UI.UserControl");
                _ucCodeBehind.WriteLine(LineText);
            }
            _pageCodeBehind.Close();
            _ucCodeBehind.Close();
        }
        string UpdatePageTag(string InputLine)
        {
            string OutPutLine = "<%@ Control Language=\"C#\" AutoEventWireup=\"true\" CodeBehind=\"{0}\" Inherits=\"{1}\" %>";
            string CodeBehind = string.Empty;
            string Inherits = string.Empty;
            string TransformedText = InputLine.Replace(" ", "");
            int indexStart = 0;
       
            //getting CodeBehind
            indexStart = TransformedText.IndexOf("CodeBehind=\"");
            indexStart = indexStart + "CodeBehind=\"".Length;
            TransformedText = TransformedText.Substring(indexStart);
            CodeBehind = TransformedText.Split("\"".ToCharArray())[0];
            CodeBehind = CodeBehind.Replace("aspx", "ascx");

            TransformedText = InputLine.Replace(" ", "");
            indexStart = 0;
            //getting Inherits
            indexStart = TransformedText.IndexOf("Inherits=\"");
            indexStart = indexStart + "Inherits=\"".Length;
            TransformedText = TransformedText.Substring(indexStart);
            Inherits = TransformedText.Split("\"".ToCharArray())[0];

            return string.Format(OutPutLine,CodeBehind ,Inherits);
        }
        void GetUCDoc()
        {
            _ucWriter = new StreamWriter(UserControlFile);
        }
        void ReadPageDoc()
        {
            _pageRader = new StreamReader(PageFile);
        }
    }