Returning Multiple Resultsets : DataReader « ADO.net Database « ASP.NET Tutorial





File: App_Code\DataLayer1.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Collections.Generic;

public class DataLayer1
{
    private static readonly string _connectionString;

    public class ProductCategory
    {
        private int _id;
        private string _name;        public int Id
        {
            get { return _id; }
            set { _id = value; }
        }

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
    }

    public class Product
    {
        private string _title;
        private int _categoryId;

        public string Title
        {
            get { return _title; }
            set { _title = value; }
        }

        public int CategoryId
        {
            get { return _categoryId; }
            set { _categoryId = value; }
        }
    }

    public static void GetProductData(List<DataLayer1.ProductCategory> productCategories, List<DataLayer1.Product> products)
    {
        string commandText = "SELECT Id,Name FROM ProductCategories;SELECT Title, CategoryId FROM Products";
        SqlConnection con = new SqlConnection(_connectionString);
        SqlCommand cmd = new SqlCommand(commandText, con);
        using (con)
        {
            con.Open();
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                DataLayer1.ProductCategory newCategory = new DataLayer1.ProductCategory();
                newCategory.Id = (int)reader["Id"];
                newCategory.Name = (string)reader["Name"];
                productCategories.Add(newCategory);
            }

            reader.NextResult();

            while (reader.Read())
            {
                DataLayer1.Product newProduct = new DataLayer1.Product();
                newProduct.Title = (string)reader["Title"];
                newProduct.CategoryId = (int)reader["CategoryID"];
                products.Add(newProduct);
            }
        }
    }

    static DataLayer1()
    {
        _connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
    }
}

            
File: Web.config

<configuration>
  <connectionStrings>
    <add name="Products" 
         connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
  </connectionStrings>
</configuration>

File: ShowDataLayer1.aspx

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Collections.Generic" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    void Page_Load()
    {
        List<DataLayer1.ProductCategory> categories = new List<DataLayer1.ProductCategory>();
        List<DataLayer1.Product> products = new List<DataLayer1.Product>();
        DataLayer1.GetProductData(categories, products);

        grdCategories.DataSource = categories;
        grdCategories.DataBind();
        grdProducts.DataSource = products;
        grdProducts.DataBind();
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show DataLayer1</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h1>Product Categories</h1>
    <asp:GridView
        id="grdCategories"
        Runat="server" />

    <h1>Products</h1>
    <asp:GridView
        id="grdProducts"
        Runat="server" />

    </div>
    </form>
</body>
</html>










18.24.DataReader
18.24.1.Using the DataReader Object
18.24.2.Iterating Through A DataReader
18.24.3.Create DataReader object from SqlCommand
18.24.4.List Binding DataReader
18.24.5.Returning Multiple Resultsets
18.24.6.Working with Multiple Active Resultsets