Set up DataRelation : DataRelation : Database C# Source Code

    




using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Text;

class Program {
    static void Main(string[] args) {
        SqlConnection thisConnection = new SqlConnection(
             @"Server=(local)\sqlexpress;Integrated Security=True;" +
             "Database=northwind");

        SqlDataAdapter thisAdapter = new SqlDataAdapter(
             "SELECT CustomerID, CompanyName FROM Customers", thisConnection);
        SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);

        DataSet thisDataSet = new DataSet();

        SqlDataAdapter custAdapter = new SqlDataAdapter(
             "SELECT * FROM Customers", thisConnection);
        SqlDataAdapter orderAdapter = new SqlDataAdapter(
             "SELECT * FROM Orders", thisConnection);
        custAdapter.Fill(thisDataSet, "Customers");
        orderAdapter.Fill(thisDataSet, "Orders");

        DataRelation custOrderRel = thisDataSet.Relations.Add("CustOrders",
             thisDataSet.Tables["Customers"].Columns["CustomerID"],
             thisDataSet.Tables["Orders"].Columns["CustomerID"]);

        foreach (DataRow custRow in thisDataSet.Tables["Customers"].Rows) {
            Console.WriteLine("Customer ID: " + custRow["CustomerID"] +
                              " Name: " + custRow["CompanyName"]);
            foreach (DataRow orderRow in custRow.GetChildRows(custOrderRel)) {
                Console.WriteLine("  Order ID: " + orderRow["OrderID"]);
            }
        }
        thisConnection.Close();
    }
}