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In the rush to get functionality out to users, security is often forgotten, neglected, or slapped together at the end In reality, security needs to be part of the upfront design so it can be thought out appropriately This chapter covers some of the security topics that I ve run across and ways to address them Here s what you ll find inside: Basic Security Concepts: Defines basic terminology and security principles discussed throughout the chapter ASPNET Security Architecture Overview: Gives a high-level overview of how IIS and ASPNET handle security Encrypting Configuration Data: Shows how to use some of the new ASPNET 20 configuration encryption features to secure configuration data Encrypting Application Data: Discusses how to create one- and two-way encryption routines to protect data from unauthorized use..

To implement your formatting properties, ASP NET will frequently render inline style.

rules. In addition, if you ve crafted the perfect stylesheet, you can still use it. It s up to you whether you want to use one or both solutions. As you ll see later in this chapter (in the section Using CSS in a Theme ), it s possible to use a stylesheet as part of a theme.

We ll begin by taking a look at some of the basic concepts and terminology discussed in the chapter.

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All themes are application-specific To use a theme in a web application, you need to create a folder that defines it You need to place this folder in a folder named App_Theme, which must be inside the top-level directory for your web application In other words, a web application named SuperCommerce might have a FunkyTheme theme in the SuperCommerce\App_Theme\FunkyTheme folder An application can contain definitions for multiple themes, as long as each theme is in a separate folder Only one theme can be active on a given page at a time In the Applying Themes Dynamically section, you ll discover how you can dynamically change the active theme when your page is processing To actually make your theme accomplish something, you need to create at least one skin file in the theme folder A skin file is a text file with the skin extension ASP .

Figure 2-10. Output from the table custom control demonstration web form Listings 2-16 and 2-17 show TableCustomControlDemo s .aspx and class files.

NET never serves skin files directly instead, they re used behind the scenes to define a theme A skin file is essentially a list of control tags with a twist The control tags in a skin file don t need to completely define the control Instead, they need to set only the properties you want to standardize For example, if you re trying to apply a consistent color scheme, you might be interested in setting properties such as ForeColor and BackColor only When you add a control tag for the ListBox control, it might look like this: <asp:ListBox runat="server" ForeColor="White" BackColor="Orange"/> The runat="server" portion is always required Everything else is optional The id attribute is not allowed in a theme, because it s required to uniquely identify each control.

Security in ASP.NET begins at the operating system level and hits a number of different components and processes along the way. You ll see as you read this chapter that IIS, ASP.NET, the file system, network shares, enterprise services, and databases all have different security measures in place, but most share some common concepts. This section is geared toward getting you familiar with some of the terminology and concepts that you ll see throughout this chapter.

It s up to you whether you create multiple skin files or place all your control tags in a single skin file Both approaches are equivalent, because ASPNET treats all the skin files in a theme directory as part of the same theme definition Often, it makes sense to separate the control tags for complex controls (such as the data controls) into separate skin files Figure 15-2 shows the relationship between themes and skins in more detail..

Listing 2-16. The TableCustomControlDemo Web Form .aspx File <%@ Page Language="C#" MasterPageFile="~/MasterPage/ControlsBook2MasterPage.Master" AutoEventWireup="true" CodeBehind="TableCustomControlDemo.aspx.cs" Inherits="ControlsBook2Web.Ch02.TableCustomControlDemo" Title="Table Custom Controls Demo" %> <%@ Register TagPrefix="apress" Namespace="ControlsBook2Lib.Ch02" Assembly="ControlsBook2Lib" %> <asp:Content ID="Content1" ContentPlaceHolderID="NumAndTitle" runat="server"> <asp:Label ID="NumberLabel" runat="server" Width="14px">2</asp:Label>  <asp:Label ID="TitleLabel" runat="server" Width="360px"> Encapsulating Functionality in ASP.NET</asp:Label> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="PrimaryContent" runat="server"> <h3> Table Custom Controls</h3> <table> <tr> <td style="width: 50%"> <apress:TableCustomControl ID="TableCust1" runat="server" Y="2" X="2"> </apress:TableCustomControl> </td> <td> <apress:TableCompCustomControl ID="TableCompCust1" runat="server" X="2" Y="2"></apress:TableCompCustomControl> </td> </tr> </table> </asp:Content> Listing 2-17. The TableCustomControlDemo Code-Behind Class File using System; namespace ControlsBook2Web.Ch02 { public partial class TableCustomControlDemo : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { TableCust1.X = 3; TableCust1.Y = 3; TableCompCust1.X = 3; TableCompCust1.Y = 3; }

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