File: App_Code\RandomDataLayer.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Collections.Generic;
public class RandomDataLayer
{
private static readonly string _connectionString;
public List<String> GetRandomProducts()
{ List<String> results = new List<String>();
SqlConnection con = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand("GetRandomRows", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@rowsToReturn", 5);
using (con)
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
results.Add((string)reader["Title"]);
}
return results;
}
public static string GetRandomProduct()
{
string result = String.Empty;
SqlConnection con = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand("GetRandomRow", con);
cmd.CommandType = CommandType.StoredProcedure;
using (con)
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
if (reader.Read())
result = (string)reader["Title"];
}
return result;
}
static RandomDataLayer()
{
_connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
}
}
File: ShowRandomDataLayer.aspx
<%@ Page Language="C#" %>
<!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()
{
lblRandomProduct.Text = RandomDataLayer.GetRandomProduct();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show RandomDataLayer</title>
</head>
<body>
<form id="form1" runat="server">
<div>
Random Product:
<asp:Label
id="lblRandomProduct"
Runat="server" />
<hr />
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
Runat="server" />
<asp:ObjectDataSource
id="srcProducts"
TypeName="RandomDataLayer"
SelectMethod="GetRandomProducts"
Runat="server" />
</div>
</form>
</body>
</html>