XMLファイルへ書き込む際のヘッダーの付加

DataSet ds = new DataSet("MyData");
DataTable tb = new DataTable("MyTable");
tb.Columns.Add("Data1",typeof(int));
tb.Columns.Add("Data2",typeof(string));
for (int i = 0;i<10;i++)
{
	DataRow r = tb.NewRow();
	r["Data1"] = i;
	r["Data2"] = i.ToString();
	tb.Rows.Add(r);
}
ds.Tables.Add(tb);

XmlTextWriter wr =
	new XmlTextWriter(Path.ChangeExtension(Application.ExecutablePath,".xml"),
					  System.Text.Encoding.UTF8);
wr.Formatting=Formatting.Indented;
wr.WriteStartDocument();
ds.WriteXml(wr);
wr.WriteEndDocument();
wr.Close();

<?xml version="1.0" encoding="utf-8"?>
<MyData>
  <MyTable>
    <Data1>0</Data1>
    <Data2>0</Data2>
  </MyTable>
  <MyTable>
    <Data1>1</Data1>
    <Data2>1</Data2>
  </MyTable>
  <MyTable>
    <Data1>2</Data1>
    <Data2>2</Data2>
  </MyTable>
  <MyTable>
    <Data1>3</Data1>
    <Data2>3</Data2>
  </MyTable>
  <MyTable>
    <Data1>4</Data1>
    <Data2>4</Data2>
  </MyTable>
  <MyTable>
    <Data1>5</Data1>
    <Data2>5</Data2>
  </MyTable>
  <MyTable>
    <Data1>6</Data1>
    <Data2>6</Data2>
  </MyTable>
  <MyTable>
    <Data1>7</Data1>
    <Data2>7</Data2>
  </MyTable>
  <MyTable>
    <Data1>8</Data1>
    <Data2>8</Data2>
  </MyTable>
  <MyTable>
    <Data1>9</Data1>
    <Data2>9</Data2>
  </MyTable>
</MyData>