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ViewState["Enable3D"] = value; } } protected override void Render(HtmlTextWriter output) { // Add DHTML style attribute if (Enable3D) output.AddStyleAttribute("FILTER", "progid:DXImageTransform.Microsoft. dropshadow(OffX=2, OffY=2, Color='gray', Positive='true'"); base.Render(output); } } } In our inheritance example, we have two main features: a property called Enable3D and an overridden Render() method. The property is used to determine whether or not to render with a 3-D look. Providing a Boolean property that allows the developer to revert to the default behavior of the base class server control is a good design guideline to follow when inheriting from rich server controls in ASP.NET. We make this property available so that it is possible to revert to the TextBox base class s look and feel without having to swap out the control. The property uses ViewState, which we cover in 3, to store the value, with a default value of true set in the control s constructor. The only other interesting code in this simple control is the Render() method. Here, we add a style attribute to the output variable to provide the 3-D look to the base TextBox control. We round out this method with a call to the base class s Render() method to finish off all the work. As in previous examples, we need an .aspx page to host our custom control and show off our new 3-D look. Figure 2-11 shows the 3-D TextBox at runtime.

The SkinID doesn t need to be unique. It just has to be unique for each control. For example, imagine you want to create an alternate set of skinned controls that use a slightly smaller font. These controls match your overall theme, but they re useful on pages that display a large amount of information. In this case, you can create new Button, TextBox, and Label controls and give each one the same skin name (such as Smaller).

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So far, the theme examples have applied relatively simple properties. However, you can create much more detailed control tags in your skin file. Most control properties support themes. If a property can t be declared in a theme, you ll receive a build error when you attempt to launch your application.

Listings 2-19 and 2-20 contain TextBox3dDemo s .aspx and class files, respectively. Listing 2-19. The TextBox3dDemo Web Form .aspx File <%@ Page Language="C#" MasterPageFile="~/MasterPage/ControlsBook2MasterPage.Master" AutoEventWireup="true" CodeBehind="TextBox3DDemo.aspx.cs" Inherits="ControlsBook2Web.Ch02.TextBox3DDemo" Title="TextBox3D 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"> <br /> <apress:TextBox3d ID="TextBox3d1" runat="server" Width="159px" Height="22px" Enable3D="True">I look 3D!</apress:TextBox3d> <br /> <br /> <apress:TextBox3d ID="Textbox3d2" runat="server" Width="159px" Height="22px" Enable3D="false">I don't!</apress:TextBox3d> <br /> </asp:Content> Listing 2-20. The TextBox3dDemo Code-Behind Class File using System; namespace ControlsBook2Web.Ch02 { public partial class TextBox3DDemo : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } } } Having a rich server control as the base class is a powerful means of packaging functionality that takes advantage of browser DHTML capabilities to generate pleasing output, as this example demonstrates. In the preceding examples, we did not provide persistent state for control properties to keep the example code simple. The lack of a persistent state requires that the control s value be set in the page s Load event if the desired value is different than what is set declaratively in the

Control developers can choose which properties you can set in a skin file by applying the Themeable attribute to the property declaration. If this attribute isn t present, the property can t be set in a theme. You ll learn more about custom control attributes in 28.

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