A Smart Form Control for ASP.NET URL Rewriting

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;

namespace David.Nelson.UI.Web
{
    /// <summary>
    /// An HtmlTextWriter that provides granular control over
    /// how attributes are written.
    /// </summary>
    public class SelectiveHtmlTextWriter : HtmlTextWriter
    {
        public SelectiveHtmlTextWriter(HtmlTextWriter writer)
            : base(writer.InnerWriter)
        {
        }

        public event SubstituteValueEventHandler WritingAttribute;

        public override void WriteAttribute(string name, string value, bool fEncode)
        {
            string valToWrite = value;
            SubstituteValueEventArgs args = new SubstituteValueEventArgs(name, value);
            if (WritingAttribute != null)
            {
                WritingAttribute(this, args);

                if (args.Cancel == false)
                    valToWrite = args.NewValue;
            }

            if (args.Cancel == false)
                base.WriteAttribute(name, valToWrite, fEncode);
        }
    }
}