Adding ASP.NET validation at runtime

using System;
using System.Collections;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace DroopyEyes.Web.Controls
{
	public class MultiValidator : WebControl,  IValidator
	{
		#region Members
		private bool isValid = true;
		private string errorMessage = "";
		private ArrayList Errors = new ArrayList();
		private ArrayList Validators = new ArrayList();
		#endregion

		#region IValidator
		void IValidator.Validate()
		{
			isValid = (Errors.Count == 0);
			foreach(string error in Errors)
			{
				StaticValidator validator = new StaticValidator();
				validator.ErrorMessage = error;
				Page.Validators.Add(validator);
				Validators.Add(validator);
			}//foreach errors
		}//Validate

		bool IValidator.IsValid
		{
			get { return isValid; }
			set { isValid = value; }
		}//IsValid
		#endregion

		protected override void OnInit(EventArgs e)
		{
			base.OnInit(e);
			Page.Validators.Add(this);
		}

		protected override void OnUnload(EventArgs e)
		{
			if (Page != null)
			{
				Page.Validators.Remove(this);
				foreach(IValidator validator in Validators)
					Page.Validators.Remove(validator);
			}//Page != null

			base.OnUnload(e);
		}


		public void AddError(string message)
		{
			Errors.Add(message);
		}//AddError



		#region Properties
		[Bindable(true)]
		[Category("Appearance")]
		[DefaultValue("")]
		public string ErrorMessage
		{
			get { return errorMessage; }
			set { errorMessage = value; }
		}//ErrorMessage
		#endregion

	}
}