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Add relation between tables in a dataset

Posted By:satyapriyanayak       Posted Date: August 17, 2013    Points: 40    Category:    URL: http://www.dotnetspark.com  

Here we will know how to add relation between tables in a dataset.

App.xml file

<?xml version="1.0" encoding="utf-8" ?>
        <add key="dsn" value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\EMP.mdb" />

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace Data_relation
    public partial class Form1 : Form
        string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["dsn"];
        OleDbCommand com;
        OleDbDataAdapter oda;
        DataSet ds;
        DataRelation dr;
        string str;
        public Form1()

        private void btndisplay_Click(object sender, EventArgs e)
            OleDbConnection con = new OleDbConnection(ConnectionString);
            str = "select * from product";
            com = new OleDbCommand(str, con);
            oda = new OleDbDataAdapter(com);
            ds = new DataSet();
            oda.Fill(ds, "product");

            str = "select * from customer";
            com = new OleDbCommand(str, con);
            oda = new OleDbDataAdapter(com);
            oda.Fill(ds, "customer");

            DataColumn dc1 = new DataColumn();
            DataColumn dc2 = new DataColumn();
            dc1 = ds.Tables["product"].Columns["prodid"];
            dc2 = ds.Tables["customer"].Columns["prodid"];
            dr = new DataRelation("Customers taking this product are", dc1, dc2);
            dataGrid1.DataSource = ds;
            dataGrid1.DataMember = "product";




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