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<%@ Page language="c#" Codebehind="parent.aspx.cs" AutoEventWireup="false" Inherits="Evolve.TemplateEngine.CommSample.ParentClass" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>communicationsample</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<LINK href="../styles/evolve.css" type="text/css" rel="stylesheet">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<P>This sample demonstrates how to communicate with nested controls that are
being added at runtime. Communication is mastered through interfaces: The page
implements <EM>IMessageMaster</EM>, the child controls implement <EM>IMessageClient</EM>
and register themselves with the page during initialization. You can find all
sources in the <EM>communicationsample</EM> folder.</P>
<P> </P>
<P>Send message:</P>
<P>
<asp:TextBox id="MessageText" runat="server" CssClass="textbox" Width="200px"></asp:TextBox>
<asp:DropDownList id="ClientList" runat="server" CssClass="textbox" Width="150px">
<asp:ListItem Value="-1">All</asp:ListItem>
</asp:DropDownList>
<asp:Button id="SendMessage" runat="server" CssClass="button" Text="Send" Width="80px"></asp:Button></P>
<P> </P>
<P>Points of Interest:</P>
<UL>
<LI>
The template overrides one of the new initialization methods that are
being available for all templates (<EM>BeforeTemplating</EM> and <EM>AfterTemplating</EM>).
Use these rather than the <EM>Page_Load</EM> method of the VS.NET designer and
access the <EM>Page</EM> object that is submitted by the template engine.</LI>
<LI>
As the button event handler is fired pretty early, the <EM>RegionProvider</EM> of
this sample works with templating time <EM>OnInit</EM> rather than the default <EM>
OnLoad</EM>. This is because the whole object tree must be available when the
button event handler kicks in - <EM>OnLoad</EM> would be too late. You can
observe a runtime exception if you set the templating time back to <EM>OnLoad</EM>.</LI>
<LI>
<FONT color="#cc0000">VB.NET Users</FONT>: Unfortunately, <EM>OnInit</EM> does
not work with VB.NET - C# and VB.NET applications work differently (somehow
strange). To render the template during <EM>OnInit</EM> in VB.NET, the
templating time needs to be set to <EM>Manual</EM>. Then, the template can be
triggered from within during the <EM>Init</EM> method in the code behind.</LI></UL>
</form>
</body>
</HTML>
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