writing xml document c#.net loop overlaying elements rather than appending

I'm trying to create an xml document and am having a problem with my loop to create my sub nodes called 'file'.  I am trying to make an xml doc much like the one below.  I have a set of file names that I loop through and get some additional data on and then create an xml set called <file> within the main <package> set.  Subsequently, if I have 10 files, I should have 10 <file> entries.  See below.  It's looping through however rather than create a new entry, it is overlaying the first one.  so when I get all done, I have the last file only.  Below is my code.  I acquired this code from the net somewhere and modified it so I haven't completely come to understand it all just yet and it may need some further modifications as I work it through but for the most part, my xml doc is looking pretty good except for the reuse of rather than adding  of a new <file> set.  The second loop in the code is where I am writing the file elements. Please advise.  Thank you!


<package><origination_id>1</origination_id>
<package_key>00220091231</package_key>
<email_flag>1</email_flag>
<file>
<grouping_level>002</grouping_level>
<statement_dt>2009-12-31</statement_dt>
<file_type>STMT</file_type>
<file_name>CP002STMT20091231.pdf</file_name>
<file_size>94015</file_size>
</file><file>
<grouping_level>002</grouping_level>
<statement_dt>2009-12-31</statement_dt>
<file_type>INV</file_type>
<file_name>CP002INV20091231.pdf</file_name>
<file_size>82015</file_size>
</file></package>

------------------------------------------------
foreach (DataRow dr in InvoicePkgsdt.Rows)
{
      filename = prestageDirectory + "\\CP" + dr["credit_account_nmbr"].ToString().TrimEnd() + Convert.ToDateTime(dr["invoice_dt"]).ToString("yyyyMMdd") + ".DDF";

      XmlDocument xmlDoc = new XmlDocument();
                              
try
      {
            xmlDoc.Load(filename);
      }

      catch (System.IO.FileNotFoundException)
      {
      //if file is not found, create a new xml file
      XmlTextWriter xmlWriter = new XmlTextWriter(filename, System.Text.Encoding.UTF8);
      xmlWriter.Formatting = Formatting.Indented;
                                                xmlWriter.WriteProcessingInstruction("xml", "version='1.0' encoding='UTF-8'");
                                          xmlWriter.WriteStartElement("Root");
      
      xmlWriter.Close();
      xmlDoc.Load(filename);
      }

XmlNode root = xmlDoc.DocumentElement;
XmlElement PackageElem = xmlDoc.CreateElement("package");
XmlElement OrigIdElem = xmlDoc.CreateElement("origination_id");
XmlElement PackageKeyElem = xmlDoc.CreateElement("package_key");
XmlElement EmailElem = xmlDoc.CreateElement("email_flag");
XmlElement FileElem = xmlDoc.CreateElement("file");
XmlElement GroupingLvlElem = xmlDoc.CreateElement("grouping_level");
XmlElement StatementDateElem = xmlDoc.CreateElement("statement_dt");
XmlElement FileTypeElem = xmlDoc.CreateElement("file_type");
XmlElement FileNameElem = xmlDoc.CreateElement("file_name");
XmlElement FileSizeElem = xmlDoc.CreateElement("file_size");


XmlText OrigIdText = xmlDoc.CreateTextNode("1");
XmlText PackageKeyText = xmlDoc.CreateTextNode(dr["credit_account_nmbr"].ToString().TrimEnd() + Convert.ToDateTime(dr["invoice_dt"]).ToString("yyyyMMdd"));
XmlText EmailText = xmlDoc.CreateTextNode("0");


root.AppendChild(PackageElem);

PackageElem.AppendChild(OrigIdElem);
OrigIdElem.AppendChild(OrigIdText);

PackageElem.AppendChild(PackageKeyElem);

PackageKeyElem.AppendChild(PackageKeyText);

PackageElem.AppendChild(EmailElem);
EmailElem.AppendChild(EmailText);

DataView Reportsdv = new DataView(Reportsdt);
                                    Reportsdv.RowFilter = "credit_account_nmbr = '" + dr["credit_account_nmbr"].ToString()
                                          + "' and invoice_dt = '" + Convert.ToDateTime(dr["invoice_dt"]).ToString() + "'";

Reportsdv.Sort = "report_cd DESC";

XmlText GroupingLvlText = xmlDoc.CreateTextNode(dr["credit_account_nmbr"].ToString().TrimEnd());
XmlText StatementDateText = xmlDoc.CreateTextNode(Convert.ToDateTime(dr["invoice_dt"]).ToString("MM/dd/yyyy"));
XmlText FileTypeText = xmlDoc.CreateTextNode("");
XmlText FileNameText = xmlDoc.CreateTextNode("");
XmlText FileSizeText = xmlDoc.CreateTextNode("");

string archiveDir = ArchiveDirectory + Convert.ToDateTime(dr["invoice_dt"]).ToString("MMyyyy") + "\\";
                                                                        
for (int int_row = 0; int_row < Reportsdv.Count; int_row++)
{
      PackageElem.AppendChild(FileElem);

                                          FileElem.AppendChild(GroupingLvlElem);
                                          GroupingLvlElem.AppendChild(GroupingLvlText);

                                          FileElem.AppendChild(StatementDateElem);
                                          StatementDateElem.AppendChild(StatementDateText);

      FileElem.AppendChild(FileTypeElem);
      FileTypeText.Value = Reportsdv[int_row]["report_file_node"].ToString().TrimEnd();
                                          FileTypeElem.AppendChild(FileTypeText);

      FileElem.AppendChild(FileNameElem);
      FileNameText.Value = Reportsdv[int_row]["FileName"].ToString();
                                          FileNameElem.AppendChild(FileNameText);

      FileElem.AppendChild(FileSizeElem);
      FileInfo fi = new FileInfo(archiveDir + Reportsdv[int_row]["FileName"].ToString());
      FileSizeText.Value = fi.Length.ToString();
                                          FileSizeElem.AppendChild(FileSizeText);

                                          
      File.Copy(archiveDir + Reportsdv[int_row]["FileName"], prestageDirectory + "\\" + Reportsdv[int_row]["FileName"]);

                                          

}

xmlDoc.Save(filename);
}