Search Text From file in ASP.NET using C#

Public string url;
protected void Button3_Click(object sender, EventArgs e)
{
    Process[] ap = Process.GetProcesses();
    foreach (Process p in ap)
    {
        if (p.ProcessName == "WINWORD")
        {
            p.Kill();
        }
    }
    StringBuilder sb = new StringBuilder();
    StringBuilder flenme = new StringBuilder();
    ArrayList li = new ArrayList();
    string pat = @"~\uploads";
    string[] filename = Directory.GetFiles(Server.MapPath(pat));
    foreach (var r in filename)
    {
        string[] split = Regex.Split(r, @"\\");
        li.Add(split [split .Length - 1]);
    }
    foreach (var j in li)
    {
        object file = Server.MapPath(pat) + "\\" + j.ToString();
        object nullobj = System.Reflection.Missing.Value;
        Microsoft.Office.Interop.Word.Application wordapp = new Microsoft.Office.Interop.Word.Application();
        Microsoft.Office.Interop.Word.Document doc = wordapp.Documents.Open(ref file, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj, ref nullobj);
        doc.ActiveWindow.Selection.WholeStory();
        doc.ActiveWindow.Selection.Copy();
        string result1 = doc.Content.Text.Trim();
        string result2 = Regex.Replace(result1, @"[\r\a]", " ");
        string result = Regex.Replace(result2, @"\s+", " ");
        char[] del = { ' ' };
        string[] SplittedResult = result.Split(del);
        doc.Close();
        url = "Default3.aspx?" + TextBox1.Text;
        foreach (string i in SplittedResult)
        {
            if (TextBox1.Text.ToLower() == i.ToLower())
            {
                sb.AppendLine("<span filename="" + j.ToString() + "" style="color: #FF0000">" + j.ToString() + "             </span><br />" + result + "<hr />");
                sb.Append("?//_\\??");
                break;
            }
        }
    }
    Session["Result"] = sb;
    if (Session["Result"].ToString() != "" && Session["Result"] != null)
    {
        Response.Write("<script language=javascript>window.open('" + url + "')</script>");
        //Response.Redirect(uri);
    }
    else
    {
        Literal1.Text = "No match Found";
    }
}

protected void Page_Load(object sender, EventArgs e)
  {
      if (Session["Result"] != null)
      {
          string sessionResult = Session["Result"].ToString();
          string FormatedResult = Regex.Replace(sessionResult , @"[\r\n]", " ");
          string FinalResult= FormatedResult .Replace("?//_\\??", "<br />");
          Response.Write(FinalResult);

      }
  }