Issue when Trying to Fire a ASP.NET Custom Control Button Event

Question

I have a simple asp.net test custom control that I have created and am trying to figure out why the click event will not fire. below is the code. I simply create an instance of the control on a test page with Page_Load of .aspx page that consumes the control protected void Page_Load(object sender, EventArgs e) { Page.Form.Controls.Add(new TestControl()); }

The page does a post back but it does not pick up the click event in the user control. Please explain what I am doing incorrectly or a better way to approach this with a specific pattern etc.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI;

namespace WorldOfTest
{
public class TestControl : WebControl { private Button btn;
protected override void OnInit(EventArgs e)
{            
    base.OnInit(e);
}

protected override void EnsureChildControls()
{
    btn = new Button();           
    this.Controls.Add(btn); 
    base.EnsureChildControls();
}

protected override void CreateChildControls()
{

    btn.Click += new EventHandler(btn_Click);  
    btn.Text = "test button";                         
    base.CreateChildControls();
}

void btn_Click(object sender, EventArgs e)
{
    throw new NotImplementedException();
}

protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
    btn.RenderControl(writer); ;
}

} }

Answer 1

When you are adding your custom control to the page use LoadControl.

var control = (TestControl)LoadControl("~/path/to/TestControl.ascx");
Page.Form.Controls.Add(control);

Answer 2

If your button is in the control collection, you don't need to override render and call btn.Render. I would also add it and subscribe to the event OnLoad. One last thing, You need to implement INamingContainer.

protected override void OnLoad(EventArgs e)
{
   btn = new Button();
   btn.Click += new EventHandler(btn_Click);  
   btn.Text = "test button";
   this.Controls.Add(btn);
}