Issue with HttpModule

I am using an HttpModule to move the viewstate component of a page to the
bottom.

The following is the code.

  

#region Usingusing System;
using System.IO;
using System.Web;
using System.Text;
using System.Text.RegularExpressions;

#endregion

namespace XXX.HttpModules
{

    /// <summary>
    /// Removes whitespace from the webpage.
    /// </summary>public class ViewstateModule : IHttpModule
    {

        #region IHttpModule Membersvoid IHttpModule.Dispose()
        {
            // Nothing to dispose; 
        }

        void IHttpModule.Init(HttpApplication context)
        {
            context.BeginRequest += new EventHandler(context_BeginRequest);
        }

        #endregion

        void context_BeginRequest(object sender, System.EventArgs e)
        {
            HttpApplication app = sender as HttpApplication;
            if (app.Request.Url.OriginalString.Contains(".aspx") ||
app.Request.Url.OriginalString.Contains(".ascx"))
            {
                app.Response.Filter = new ViewstateFilter(app.Response.Filter);
            }
        }

        #region Stream filterprivate class ViewstateFilter : Stream
        {

            public ViewstateFilter(Stream sink)
            {
                _sink = sink;
            }

            private Stream _sink;

            #region Properitespublic override bool CanRead
            {
                get { return true; }
            }

            public override bool CanSeek
            {
                get { return true; }
            }

            public override bool CanWrite
            {
                get { return true; }
            }

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

            public override long Length
            {
                get { return 0; }
            }

            private long _position;
            public override long Position
            {
                get { return _position; }
                set { _position = value; }
            }

            #endregion

            #region Methodspublic override int Read(byte[] buffer, int offset,
int count)
            {
                return _sink.Read(buffer, offset, count);
            }

            public override long Seek(long offset, SeekOrigin origin)
            {
                return _sink.Seek(offset, origin);
            }

            public override void SetLength(long value)
            {
                _sink.SetLength(value);
            }

            public override void Close()
            {
                _sink.Close();
            }

            public override void Write(byte[] buffer, int offset, int count)
            {
                byte[] data = new byte[count];
                Buffer.BlockCopy(buffer, offset, data, 0, count);
                string html = System.Text.Encoding.Default.GetString(buffer);

                int startPoint = html.IndexOf("&lt;input
type=\"hidden\" name=\"__VIEWSTATE\"");
                if (startPoint >= 0)
                {
                    int endPoint = html.IndexOf("/>", startPoint) +
2;
                    string viewstateInput = html.Substring(startPoint, endPoint
- startPoint);
                    html = html.Remove(startPoint, endPoint - startPoint);
                    int formEndStart =
html.IndexOf("&lt;/form>") - 1;
                    if (formEndStart >= 0)
                    {
                        html = html.Insert(formEndStart, viewstateInput);
                    }
                }

                byte[] outdata = System.Text.Encoding.Default.GetBytes(html);
                _sink.Write(outdata, 0, outdata.GetLength(0));
            }

            #endregion

        }

        #endregion

    }

}
 

The issue I have is that the HttpModule is not doing what it is created to do.
It randomly places text on the screen, messing with layout etc. Its occuring on
every page of my site. Could someone assist me with why this might be happening?
Is it the code or possibly the setup? I am using another HttpModules on my site
to rewrite url's and dont have any issue with this.

Help would be appreciated.

I think this is possible, guess you are not inserting at the right place that
cause the mess of the layout. Could you provide the html output?

This is an example of the text it randomly places on a page

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What The Hell Is That?

andyl68:What The Hell Is That? 

The html output!