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To create a user control in Visual Studio, select Website Add New Item, and choose the Web User Control template. The following is the simplest possible user control one that merely contains static HTML. This user control represents a header bar. <%@ Control Language="C#" AutoEventWireup="true" CodeFile="Header.ascx.cs" Inherits="Header" %> <table width="100%" border="0" bgcolor="blue"> <tr> <td><font face="Verdana,Arial" size="6" color="yellow"><b> User Control Test Page</b></font> </td> </tr> <tr> <td align="right"><font size="3" color="white"><b> An Apress Creation 2004</b></font>    </td> </tr> </table> You ll notice that the Control directive identifies the code-behind class. However, the simple header control doesn t require any custom code to work, so you can leave the class empty: public partial class Header : System.Web.UI.UserControl {} As with ASP.NET web forms, the user control is a partial class, because it s merged with a separate portion generated by ASP.NET. That automatically generated portion has the member variables for all the controls you add at design time. Now to test the control, you need to place it on a web form. First, you need to tell the ASP.NET page that you plan to use that user control with the Register directive, as shown here: <%@ Register TagPrefix="apress" TagName="Header" Src="Header.ascx" %>

Having each control locked into a single format is great for standardization, but it s probably not flexible enough for a real-world application. For example, you might have several types of text boxes that are distinguished based on where they re used or what type of data they contain. Labels are even more likely to differ, depending on whether they re being used for headings or for body text. Fortunately, ASP.NET allows you to create multiple declarations for the same control. Ordinarily, if you create more than one theme for the same control, ASP .NET will give you a build error stating that you can have only a single default skin for each control. To get around this problem, you need to create a named skin by supplying a SkinID attribute. Here s an example: <asp:ListBox runat="server" ForeColor="White" BackColor="Orange" /> <asp:TextBox runat="server" ForeColor="White" BackColor="Orange" /> <asp:Button runat="server" ForeColor="White" BackColor="Orange" /> <asp:TextBox runat="server" ForeColor="White" BackColor="DarkOrange" Font-Bold="True" SkinID="Dramatic"/> <asp:Button runat="server" ForeColor="White" BackColor="DarkOrange" Font-Bold="True" SkinID="Dramatic"/>

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You can get the technical lowdown on CSS at http://www.w3.org/Style/CSS, or you can visit http://www.w3schools.com/css for a thorough tutorial.

This line identifies the source file that contains the user control using the Src attribute. It also defines a tag prefix and tag name that will be used to declare a new control on the page. In the same way that ASP.NET server controls have the <asp: ... > prefix to declare the controls (for example, <asp:TextBox>), you can use your own tag prefixes to help distinguish the controls you ve created. This example uses a tag prefix of apress and a tag named Header. The full tag is shown in this page: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="HeaderTest.aspx.cs" Inherits="HeaderTest" %> <%@ Register TagPrefix="apress" TagName="Header" Src="Header.ascx" %> <html> <head> <title>HeaderHost</title> </head> <body> <form id="Form1" method="post" runat="server"> <apress:Header id="Header1" runat="server"></apress:Header> </form> </body> </html> At a bare minimum, when you add a user control to your page, you should give it a unique ID and indicate that it runs on the server, like all ASP .NET controls. Figure 14-1 shows the sample page with the custom header.

The catch is that named skins aren t applied automatically like default skins. To use a named skin, you need to set the SkinID of the control on your web page to match. You can choose this value from a drop-down list that Visual Studio creates based on all your defined skin names, or you can type it in by hand: <asp:Button ID="Button1" runat="server" ... SkinID="Dramatic" /> If you don t like the opt-in model for themes, you can make all your skins named. That way, they ll never be applied unless you set the control s SkinID.

With CSS, you use a stylesheet to define a set of formatting presets. You then link this stylesheet to the appropriate control using the CssClass property. To try it and add an (almost) empty stylesheet to your web project, choose Website Add New Item in Visual Studio. Then select Style Sheet, and click OK.

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