How to create nested XML from datatable or dataset without looping?

        DataSet ds = new DataSet("EmployeeList");

        //create table address
        DataTable address = new DataTable("Address");
        DataColumn column;

        //add column id
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.Int32");
        column.ColumnName  = "ID";
        address.Columns.Add(column);
        //address.PrimaryKey = new DataColumn[1] { column };

        //add column City
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "City";
        address.Columns.Add(column);

        //add column State
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "State";
        address.Columns.Add(column);

        //add column Country
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "Country";
        address.Columns.Add(column);

        ds.Tables.Add(address); //add table address to dataset

        //create table employee
        DataTable employee = new DataTable("Employee");

        //add column ID
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.Int32");
        column.ColumnName = "ID";
        employee.Columns.Add(column);
        employee.PrimaryKey = new DataColumn[1] { column };

        //add column Name
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "Name";
        employee.Columns.Add(column);

        //add column Address
        //column = new DataColumn();
        //column.DataType = System.Type.GetType("System.Int32");
        //column.ColumnName = "Address";
        //employee.Columns.Add(column);

        ds.Tables.Add(employee); //add table employee to dataset

        //set foreign key constraint
        //ForeignKeyConstraint fk = new ForeignKeyConstraint("AddressFK", 
        //ds.Tables["Address"].Columns["ID"], ds.Tables["Employee"].Columns["Address"]);

        //fk.DeleteRule = Rule.None;
        //ds.Tables["Employee"].Constraints.Add(fk);

        //
        // fill data to data set
        //
        DataRow row;
        row = address.NewRow();
        row["ID"] = 1;
        row["City"] = "test";
        row["State"] = "test";
        row["Country"] = "test";

        address.Rows.Add(row);

        row = employee.NewRow();
        row["Name"] = "abc";
        row["ID"] = 1;
        //row["Address"] = 1;

        employee.Rows.Add(row);

        DataRelation relation = ds.Relations.Add("relation", ds.Tables["Employee"].Columns["ID"], ds.Tables["Address"].Columns["ID"]);
        relation.Nested = true;

        ds.WriteXml("test.txt"); //create xml from dataset

What I'm trying to do here is creating 2 tables Employee and Address. Address has 4 columns ID - foreign key that refer to Employee primary key, State, City, Country. Employee has 2 columns Name, ID - primary key. Then add those tables to dataset ds. Finally, create xml from ds.

P/S: I write this in pure text (without using IDE because this computer doesn't has any IDE :(, so if any error on typo or syntax, please let me know)

UPDATE I updated the code, now the result XML will look like this:

<?xml version="1.0" standalone="yes"?>
<EmployeeList>
  <Employee>
    <ID>1</ID>
    <Name>abc</Name>
    <Address>
      <ID>1</ID>
      <City>test</City>
      <State>test</State>
      <Country>test</Country>
    </Address>
  </Employee>
</EmployeeList>

I made a mistake with the relationship from last time, it should be a foreign key in address that refer to employee primary key (in this case, I user column ID)

UPDATE2 to exclude ID from Address, add this line right before you call ds.WriteXML("test.xml")

ds.Tables["Address"].Columns["ID"].ColumnMapping = MappingType.Hidden;

You can also add following line to exclude ID from employee as well:

ds.Tables["Employee"].Columns["ID"].ColumnMapping = MappingType.Hidden;