I wanna change all English numbers to Persian for showing to users. and change them to English numbers again for giving all requests (Postbacks)

e.g:
we have something like this in view IRQ170, I wanna show IRQ??? to users and give IRQ170 from users.

I know, I have to use Httpmodule, But I don't know how ?
Could you please guide me?

Edit :

Let me describe more :

I've written the following http module :

using System;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.UI;
using Smartiz.Common;

namespace Smartiz.UI.Classes
{
    public class PersianNumberModule : IHttpModule
    {
        private StreamWatcher _watcher;

        #region Implementation of IHttpModule

        /// <summary>
        /// Initializes a module and prepares it to handle requests.
        /// </summary>
        /// <param name="context">An <see cref="T:System.Web.HttpApplication"/> that provides access to the methods, properties, and events common to all application objects within an ASP.NET application </param>
        public void Init(HttpApplication context)
        {
            context.BeginRequest += ContextBeginRequest;
            context.EndRequest += ContextEndRequest;
        }

        /// <summary>
        /// Disposes of the resources (other than memory) used by the module that implements <see cref="T:System.Web.IHttpModule"/>.
        /// </summary>
        public void Dispose()
        {
        }

        #endregion

        private void ContextBeginRequest(object sender, EventArgs e)
        {
            HttpApplication context = sender as HttpApplication;
            if (context == null) return;
            _watcher = new StreamWatcher(context.Response.Filter);
            context.Response.Filter = _watcher;
        }

        private void ContextEndRequest(object sender, EventArgs e)
        {
            HttpApplication context = sender as HttpApplication;
            if (context == null) return;
            _watcher = new StreamWatcher(context.Response.Filter);
            context.Response.Filter = _watcher;
        }

    }

    public class StreamWatcher : Stream
    {
        private readonly Stream _stream;
        private readonly MemoryStream _memoryStream = new MemoryStream();

        public StreamWatcher(Stream stream)
        {
            _stream = stream;
        }

        public override void Flush()
        {
            _stream.Flush();
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            int bytesRead = _stream.Read(buffer, offset, count);

            string orgContent = Encoding.UTF8.GetString(buffer, offset, bytesRead);
            string newContent = orgContent.ToEnglishNumber();
            int newByteCountLength = Encoding.UTF8.GetByteCount(newContent);
            Encoding.UTF8.GetBytes(newContent, 0, Encoding.UTF8.GetByteCount(newContent), buffer, 0);

            return newByteCountLength;
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            string strBuffer = Encoding.UTF8.GetString(buffer, offset, count);

            MatchCollection htmlAttributes = Regex.Matches(strBuffer, @"(\S+)=[""']?((?:.(?![""']?\s+(?:\S+)=|[>""']))+.)[""']?", RegexOptions.IgnoreCase | RegexOptions.Multiline);
            foreach (Match match in htmlAttributes)
            {
                strBuffer = strBuffer.Replace(match.Value, match.Value.ToEnglishNumber());
            }

            MatchCollection scripts = Regex.Matches(strBuffer, "<script[^>]*>(.*?)</script>", RegexOptions.Singleline | RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
            foreach (Match match in scripts)
            {
                MatchCollection values = Regex.Matches(match.Value, @"([""'])(?:(?=(\\?))\2.)*?\1", RegexOptions.Singleline | RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
                foreach (Match stringValue in values)
                {
                    strBuffer = strBuffer.Replace(stringValue.Value, stringValue.Value.ToEnglishNumber());
                }
            }

            MatchCollection styles = Regex.Matches(strBuffer, "<style[^>]*>(.*?)</style>", RegexOptions.Singleline | RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
            foreach (Match match in styles)
            {
                strBuffer = strBuffer.Replace(match.Value, match.Value.ToEnglishNumber());
            }

            byte[] data = Encoding.UTF8.GetBytes(strBuffer);

            _memoryStream.Write(data, offset, count);
            _stream.Write(data, offset, count);
        }

        public override string ToString()
        {
            return Encoding.UTF8.GetString(_memoryStream.ToArray());
        }

        #region Rest of the overrides
        public override bool CanRead
        {
            get { throw new NotImplementedException(); }
        }

        public override bool CanSeek
        {
            get { throw new NotImplementedException(); }
        }

        public override bool CanWrite
        {
            get { throw new NotImplementedException(); }
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            throw new NotImplementedException();
        }

        public override void SetLength(long value)
        {
            throw new NotImplementedException();
        }

        public override long Length
        {
            get { throw new NotImplementedException(); }
        }

        public override long Position
        {
            get
            {
                throw new NotImplementedException();
            }
            set
            {
                throw new NotImplementedException();
            }
        }
        #endregion
    }
}

It works well, but It converts all numbers in css and scripts files to Persian and it causes error.