error in filtering data from xml binding of dropdownlist

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C#

ASP.NET

XML

C#4.0

, +

<stat>
  <state>
    <stateid>102</stateid>
    <statename>ajmer</statename>
  </state>
  <state>
    <stateid>102</stateid>
    <statename>kota</statename>
  </state>
  <state>
    <stateid>103</stateid>
    <statename>sikar</statename>
  </state>
  <state>
    <stateid>103</stateid>
    <statename>Bikaner</statename>
  </state>
</stat>

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
  {
      string st = (DropDownList1.SelectedItem.Value).ToString();

      XDocument main = XDocument.Load(Server.MapPath(@"~\XMLFile.xml"));


      var query = from user in main.Descendants("state")
                  where st == user.Element("stateid").Value
                  select user;

      DropDownList2.DataSource = query;
      DropDownList2.DataTextField = "statename";
      DropDownList2.DataBind();
  }

my result is coming like this in dropdown as simple its not filtering

<state><stateid>102</stateid><statename>ajmer</statename></state>

<state><stateid>102</stateid><statename>kota</statename></state>

and i want to show simple ajmer and kota in dropdown