Use DLL Component : DLL « Custom Controls « ASP.NET Tutorial

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="TestPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="lblResult" runat="server"></asp:Label>
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Components;

public partial class TestPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SimpleTest testComponent = new SimpleTest();
        SimpleTest2 testComponent2 = new SimpleTest2();
        lblResult.Text = testComponent.GetInfo("Hello") + "<br><br>";
        lblResult.Text += testComponent2.GetInfo("Bye");

    }
}

File: SimpleTest.cs


using System;
using System.Collections.Generic;
using System.Text;

namespace Components
{
    public class SimpleTest
    {
        public string GetInfo(string param)
        {
            return "SimpleTest.GetInfo() with '" +
                   param + "'";
        }
    }

    public class SimpleTest2
    {
        public string GetInfo(string param)
        {
            return "SimpleTest2.GetInfo() with '" +
                   param + "'";
        }
    }

}
14.5.DLL
	14.5.1.	Use DLL Component