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    <p>Well I believe you almost got it.</p> <p>BTW. The UserControl is not rendered using Visual Studio Designer, however when you run the application the control works. This is different if you use Server Controls instead, in that case, the control is displayed correctly in the Visual Studio designer</p> <p>The following code works great to build <strong>templated user controls and templated server controls</strong> however, if you would like to add binding capabilities, the process is slightly different, <a href="http://msdn.microsoft.com/en-us/library/aa479322.aspx" rel="noreferrer">take a look</a></p> <p><a href="http://sdrv.ms/N3hTFA" rel="noreferrer">Download Source Code</a></p> <h2>This is the code to create a templated <code>UserControl</code>.</h2> <h3>Simple Output</h3> <p><img src="https://i.stack.imgur.com/5sPXi.png" alt="enter image description here"></p> <h3>Template Container</h3> <pre><code>public class MyTemplateContainer : Control, INamingContainer { } </code></pre> <h3>ASPX Code behind</h3> <pre><code>protected void Page_Load(object sender, EventArgs e) { // just to demonstrate using the contorl this.WebUserControl1.Controls.Add(new LiteralControl("&lt;br /&gt;new control")); } </code></pre> <h3>ASPX</h3> <pre><code>&lt;%@ Register src="WebUserControl.ascx" tagname="WebUserControl" tagprefix="uc1" %&gt; &lt;uc1:WebUserControl ID="WebUserControl1" runat="server"&gt; &lt;ContentTemplate&gt; My Template&lt;br /&gt; &lt;asp:Label Text='Hello People' runat="server" ID="lblMessage" /&gt; &lt;/ContentTemplate&gt; &lt;/uc1:WebUserControl&gt; </code></pre> <h3>ASCX Code behind</h3> <pre><code>public partial class WebUserControl : System.Web.UI.UserControl { [TemplateContainer(typeof(MyTemplateContainer))] [TemplateInstance(TemplateInstance.Single)] [PersistenceMode(PersistenceMode.InnerProperty)] [Browsable(true)] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public ITemplate ContentTemplate { get; set; } protected void Page_Init(object sender, EventArgs e) { this.myPlaceHolderTag.Controls.Clear(); if (this.ContentTemplate != null) { var container = new MyTemplateContainer(); this.ContentTemplate.InstantiateIn(container); this.myPlaceHolderTag.Controls.Add(container); } else { this.myPlaceHolderTag.Controls.Add(new LiteralControl("No template defined")); } } } </code></pre> <h3>ASCX</h3> <pre><code>&lt;%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %&gt; &lt;asp:PlaceHolder runat="server" ID="myPlaceHolderTag" /&gt; </code></pre> <h2>Code to add a templated Server Control</h2> <h3>Output</h3> <p><img src="https://i.stack.imgur.com/VI9Kb.png" alt="enter image description here"></p> <h3>ASPX</h3> <pre><code>&lt;%@ Register Namespace="MyControls" TagPrefix="my" %&gt; &lt;my:MyServerControl runat="server" ID="myServerControl"&gt; &lt;ContentTemplate&gt; My Server templated control&lt;br /&gt; &lt;asp:Label Text="My Label" runat="server" /&gt; &lt;/ContentTemplate&gt; &lt;/my:MyServerControl&gt; </code></pre> <h3>Template Container</h3> <pre><code>namespace MyControls { [ToolboxItem(false)] public class MyTemplateContainer : Control, INamingContainer { } } </code></pre> <h3>Templated Server Control</h3> <pre><code>namespace MyControls { [ToolboxData("&lt;{0}:MyServerControl runat=server &gt;")] [ToolboxItem(true)] [ParseChildren(true)] // you can inherit from another control if you like, for example from the CompositeControl public class MyServerControl : Control, INamingContainer { [TemplateInstance(TemplateInstance.Multiple)] [TemplateContainer(typeof(MyTemplateContainer))] [PersistenceMode(PersistenceMode.InnerProperty)] [Browsable(true)] [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] [DefaultValue(null)] public ITemplate ContentTemplate { get; set; } protected override void CreateChildControls() { var p = new Panel { ID = "myPanel", BackColor = Color.Silver, Width = new Unit("100%") }; if (this.ContentTemplate == null) { p.Controls.Add(new LiteralControl("No content has been specified")); } else { var c = new MyTemplateContainer(); this.ContentTemplate.InstantiateIn(c); p.Controls.Add(c); } this.Controls.Clear(); this.Controls.Add(p); } public override void DataBind() { this.CreateChildControls(); this.ChildControlsCreated = true; base.DataBind(); } public override ControlCollection Controls { get { this.EnsureChildControls(); return base.Controls; } } } } </code></pre> <p>References:</p> <ul> <li><p><a href="http://msdn.microsoft.com/en-us/library/36574bf6.aspx" rel="noreferrer">How to: Create Templated ASP.NET User Controls</a></p></li> <li><p><a href="http://msdn.microsoft.com/en-us/library/aa478964.aspx" rel="noreferrer">Building Templated Custom ASP.NET Server Controls</a></p></li> <li><p><a href="http://msdn.microsoft.com/en-us/library/aa479322.aspx" rel="noreferrer">Building DataBound Templated Custom ASP.NET Server Controls</a></p></li> </ul>
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    1. POHow to add a Templating to a UserControl?
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    1. CO@IanBoyd - When I tested this it worked fine for me. Have you had the chance to test Jupaol's answer?
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    2. CO@peter i've actually not had a chance to test it; as i'm on vacation this week (and away from the offending Visual Studio 2010 ASP.net web-site that contains the buggy control). i will certainly be testing it soon; as no longer being able to view any pages at design-time is a *real* hinderance.
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    3. CO@peter Unfortunately i cannot say that this solves the problem of Visual Studio not being able to render a page that contains `ContentTemplate` until i solve the separate problem of Visual Studio not being able to render a page that contains `ContentTemplate`. The difference is that one is **my** own `UserControl`, the other is **Microsoft's** `UpdatePanel`. And while the solution here (stop using `UserControls`) might work, i can't update Microsoft Ajax Toolkit to tell **them** to stop using `UserControls`. So i'm stuck with pages i cannot edit.
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