Материал из .Net Framework эксперт
Get value from Configuration Settings
<%@ Page Language="VB" %>
<html>
<head>
<script runat="server">
Sub Page_Load()
Message1.Text &= ConfigurationSettings.AppSettings("machineConfigKey")
Message2.Text &= ConfigurationSettings.AppSettings("applicationConfigKey")
End Sub
</script>
</head>
<body>
<asp:label id="Message1" runat="server">Machine.Config setting: </asp:label>
<br/>
<asp:label id="Message2" runat="server">Web.Config setting: </asp:label>
</body>
</html>
<%--
<configuration>
<appSettings>
<add key="applicationConfigKey" value="bar"/>
</appSettings>
<system.web>
<authorization>
<deny users="?"/>
</authorization>
</system.web>
</configuration>
--%>