The AnywherePlaceHolder. Part 3. The AnywhereValidationSummaryPlaceHolder

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Function : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
		// You can choose to add controls programmatically or in the HTML designer.

		Button dosomething = new Button();
		dosomething.Text = "Do something";
		dosomething.UseSubmitBehavior = false;

		this.ButtonPlaceHolder.Controls.Add(dosomething);

		Button submit = new Button();
		submit.Text = "Submit";
		submit.UseSubmitBehavior = true;

		this.ButtonPlaceHolder.Controls.Add(submit);

		if (this.IsPostBack)
		{
			Label l = new Label();
			l.Text = "Page has been posted back";
			this.Form.Controls.AddAt(0,l);
		}
	}
}