using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Testing
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        DataSet ds = new DataSet("test");
        DataTable One = new DataTable("One");
        DataColumn one = new DataColumn("one", Type.GetType("System.String"));

        DataTable Two = new DataTable("Two");
        DataColumn two = new DataColumn("two", Type.GetType("System.String"));

        private void Form1_Load(object sender, EventArgs e)
        {
            one.AllowDBNull = false;
            one.Unique = true;
            two.AllowDBNull = false;
            two.Unique = true;

            One.Columns.Add(one);
            Two.Columns.Add(two);
            ds.Tables.AddRange(new DataTable[] { One, Two });
            dataGridView1.DataSource = ds.Tables["one"];
            dataGridView2.DataSource = ds.Tables["two"];

            DataRelation dr = new DataRelation("test",
               ds.Tables["One"].Columns["one"],
               ds.Tables["Two"].Columns["two"], true);
            ds.Relations.Add(dr);
        }
    }
}