In this blog we will know how to add relation between tables
in a dataset.
App.xml file
<?xml version="1.0" encoding="utf-8"
?>
<configuration>
<appSettings>
<add key="dsn"
value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=..\EMP.mdb" />
</appSettings>
</configuration>
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()
{
InitializeComponent();
}
private void btndisplay_Click(object
sender, EventArgs e)
{
OleDbConnection con
= new OleDbConnection(ConnectionString);
con.Open();
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");
con.Close();
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);
ds.Relations.Add(dr);
dataGrid1.DataSource = ds;
dataGrid1.DataMember = "product";
}
}
}