Using XmlDataSource in a Standalone Program

How does one successfully use an XmlDataSource in a stand-alone program to populate a DataGridView

All of the samples I see will work fine on a web page but it just doesn't work standalone. Am I missing something obvious Do I need another cup of coffee

TIA!

Ken

Here's my code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Web;
using System.Web.UI.WebControls;
//using System.Web.UI.WebControls;

namespace xml_data1
{
public partial class Form1 : Form
{
public XmlDataSource XMLDataSet;

private void Form1_Load(object sender, EventArgs e)
{
XMLDataSet = new XmlDataSource();

XMLDataSet.DataFile = (@"D:\work\myplay\xml_data1\xml_data1\XMLData.xml");

// the below DOES retrieve the data
XmlDocument dadata = XMLDataSet.GetXmlDocument();

XMLDataSet.DataBind();
//
//dgMain.DataSource = dadata; // nope
dgMain.DataSource = XMLDataSet;
//dgMain.DataMember = "Customer";
}
}
}