Using Property Extender Providers with ASP.NET 2.0

using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;

namespace MultifieldValidator
{
    /// <summary>
    /// collection class that serves as a container
    /// for the validators
    /// </summary>
    public class TextValidatorCollection : CollectionBase
    {
        private ValidatorControl m_Control;

        public TextValidatorCollection(ValidatorControl control)
        {
            m_Control = control;
        }

        // Gets and sets validator at the specified position
        public TextValidator this[int index]
        {
            get 
            { 
                return (TextValidator)InnerList[index]; 
            }
            set 
            { 
                InnerList[index] = value;
            }
        }

        /// <summary>
        /// this method is overriden to ensure that each
        /// validator at design time has a reference
        /// to its parent validator control
        /// </summary>
        /// <param name="value"></param>
        protected override void OnValidate(object value)
        {
            (value as TextValidator).HostingControl = m_Control;
        }


        public void Add(TextValidator validator)
        {
            InnerList.Add(validator);
        }


        public void AddAt(int index, TextValidator validator)
        {
            InnerList.Insert(index, validator);
        }

    }
}