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File: ItemRotator.cs
using System;
using System.Collections;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
namespace myControls
{
[ParseChildren(true, "Items")]
public class ItemRotator : CompositeControl
{
private ArrayList _items = new ArrayList();
[Browsable(false)]
public ArrayList Items
{
get { return _items; }
}
protected override void CreateChildControls()
{
Random rnd = new Random();
int index = rnd.Next(_items.Count);
Control item = (Control)_items[index];
this.Controls.Add(item);
}
}
public class Item : Control
{
}
}
File: Default.aspx
<%@ Page Language="C#" Trace="true" %>
<%@ Register TagPrefix="custom" Namespace="myControls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show ItemRotator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<custom:ItemRotator
id="ItemRotator1"
Runat="server">
<custom:item ID="Item1" runat="server">
First Item
</custom:item>
<custom:item ID="Item2" runat="server">
Second Item
<asp:Calendar
id="Calendar1"
Runat="server" />
</custom:item>
<custom:item ID="Item3" runat="server">
Third Item
</custom:item>
</custom:ItemRotator>
</div>
</form>
</body>
</html>
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