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Listing 7.3 - Web.Config

illustrates how to register a user control in the web.config file so that it can be used in an application.

Listing 7.3 - Web.config
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<?xml version="1.0"?>
<configuration>
    <system.web>
        <pages>
            <controls>
                <add
                  tagPrefix="user"
                  tagName="RandomImage"
                  src="~/UserControls/RandomImage.ascx"/>
            </controls>
        </pages>
    </system.web>
</configuration>

After you register a user control in the web.config file, you can use the control in a page without registering it.

Listing 7.4 - ShowAppRegister.aspx (C#)
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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Application Register</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    <user:RandomImage
        ID="RandomImage1"
        Runat="Server" />
    
    </div>
    </form>
</body>
</html>