Using ASP.NET Intrinsics in a Component : Assembly « Development « ASP.NET Tutorial

using System.Web;

public class Preferences
{
    public static string FavoriteColor
    {
        get
        {
            HttpContext context = HttpContext.Current;
            context.Trace.Warn("Getting FavoriteColor");
            if (context.Session["FavoriteColor"] == null)
                return "Blue";
            else
                return (string)context.Session["FavoriteColor"];
        }
        set
        {
            HttpContext context = HttpContext.Current;
            context.Trace.Warn("Setting FavoriteColor");
            context.Session["FavoriteColor"] = value;
        }
    }
}

            
File: Default.aspx

<%@ Page Language="C#" trace="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">

    void Page_PreRender()
    {
        body1.Style["background-color"] = Preferences.FavoriteColor;
    }

    protected void btnSelect_Click(object sender, EventArgs e)
    {
        Preferences.FavoriteColor = ddlFavoriteColor.SelectedItem.Text;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <style type="text/css">
        .content
        {
            width:80%;
            padding:20px;
            background-color:white;
        }
    </style>
    <title>Show Preferences</title>
</head>
<body id="body1" runat="server">
    <form id="form1" runat="server">
    <div class="content">

    <h1>Show Preferences</h1>

    <asp:DropDownList
        id="ddlFavoriteColor"
        Runat="server">
        <asp:ListItem Text="Blue" />
        <asp:ListItem Text="Red" />
        <asp:ListItem Text="Green" />
    </asp:DropDownList>
    <asp:Button
        id="btnSelect"
        Text="Select"
        Runat="server" OnClick="btnSelect_Click" />
    </div>
    </form>
</body>
</html>

9.3.Assembly
	9.3.1.	Building Component Libraries by Using the C# Command-Line Compiler
	9.3.2.	Make an assembly available to an ASP.NET application
	9.3.3.	Adding an Assembly to the Global Assembly Cache
	9.3.4.	Building Basic Components
	9.3.5.	Components and Dynamic Compilation
	9.3.6.	Mixing Different Language Components in the App_Code Folder
	9.3.7.	Declaring Methods
	9.3.8.	Declaring Fields and Properties
	9.3.9.	Component with Property
	9.3.10.	Adding comments to a component.
	9.3.11.	Using ASP.NET Intrinsics in a Component
	9.3.12.	Load server side assembly