I have created two aspx which retrives data from an SQL-server and
writes the responses to the Treeview-Control. I have added my two code
samples at the bottom.

The thing is that when i try to run my page with the treeview I recieve the
following error -  There is invalid data at the root level. Line 1, 
position
1. Exception Details: System.Xml.XmlException: There is invalid data at the
root level. Line 1, position 1.

Example of my xml-file
<TREENODES>
  <TreeNode Text="Test " TreeNodeSrc="Samplegroups.aspx?study_ID=1" />
</TREENODES>

Does any of you have an explaination or idea about what to do.

Thanks in advance

Lars


TopNodes
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<%@ Page language="c#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient"%>
<%@ Import Namespace="System.Configuration"%>
<Script runat="server">

  private void Page_Load(object sender, System.EventArgs e){

      SqlConnection sqlConn = new
SqlConnection(ConfigurationSettings.AppSettings["conStr"]);
      string qryStr = "SELECT StudyName AS Text,
'Samplegroups.aspx?study_ID=' + LTRIM(STR(Study_ID))" +
      "AS TreeNodeSrc FROM Study As TreeNode FOR XML AUTO, XMLDATA";
      SqlCommand cmdStudy = new SqlCommand(qryStr, sqlConn);

      sqlConn.Open();
      System.Data.DataSet dsStudies = new DataSet();
      dsStudies.ReadXml(cmdStudy.ExecuteXmlReader(), XmlReadMode.Fragment);
      dsStudies.DataSetName = "TREENODES";
      dsStudies.WriteXml(Response.OutputStream);

      sqlConn.Close();

  }

</Script>

Nodes
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<%@ Page language="c#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient"%>
<%@ Import Namespace="System.Configuration"%>
<Script runat="server">
  private void Page_Load(object sender, System.EventArgs e){

    SqlConnection sqlConn = new
SqlConnection(ConfigurationSettings.AppSettings["conStr"]);
    string qryStr = "SELECT SamIdent AS Text FROM SampleGroup AS TREENODE" 
+
                    "WHERE Study_ID=@study_ID FOR XML AUTO, XMLDATA"
    SqlCommand cmdSampleGroup = new SqlCommand(qryStr, sqlConn);
    cmdSampleGroup.Parameters.Add( New SqlParaameter( "@study_ID",
Request.QueryString("study_ID")));
    sqlConn.Open();
    System.Data.DataSet dsSampleGroups= new DataSet();
    dsSampleGroups.ReadXml(cmdSampleGroup.ExecuteXmlReader(),
XmlReadMode.Fragment);
    dsSampleGroups.DataSetName = "TREENODES";
    sqlConn.Close();
 }


</Script>