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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>
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