CompressPageStatePersister

public class CompressPageStatePersister:PageStatePersister
    {
        private string pagestateKey = "__VIEWSATE";

        public CompressPageStatePersister(Page p):base(p)
        {

        }

        public override void Save()
        {
            if (!Page.EnableViewState)
            {
                this.ViewState = null;
            }
            if (this.ViewState !=null || this.ControlState != null)
            {
                Pair state = new Pair(ViewState, ControlState);
                var str = CompressHelp.Compress(state);
                Page.ClientScript.RegisterHiddenField(this.pagestateKey, str);
            }
        }
        public override void Load()
        {
            string postbackState = Page.Request.Form[pagestateKey];
            if (!string.IsNullOrEmpty(postbackState))
            {
                Pair statePair =(Pair) CompressHelp.Decompress(postbackState);
                if (!Page.EnableViewState)
                {
                    this.ViewState = null;
                }
                else
                {
                    this.ViewState = statePair.First;
                }
                this.ControlState = statePair.Second;
            }
        }

        
    }

    public class CompressHelp 
    {
        private static LosFormatter formatter = new LosFormatter();
        public static string Compress(object state)
        {
            StringWriter writer = new StringWriter();
            formatter.Serialize(writer, state);
            string stateString = writer.ToString();
            writer.Close();
            byte[] buffer = Convert.FromBase64String(stateString);
            MemoryStream ms = new MemoryStream();
            GZipStream zipStream = new GZipStream(ms, CompressionMode.Compress, true);
            zipStream.Write(buffer, 0, buffer.Length);
            zipStream.Close();
            buffer = new byte[ms.Length];
            ms.Position = 0;
            ms.Read(buffer, 0, buffer.Length);
            ms.Close();
            stateString = Convert.ToBase64String(buffer);
            return stateString; 
        }

        public static object Decompress(string stateString)
        {
            byte[] buffer = Convert.FromBase64String(stateString);
            MemoryStream ms = new MemoryStream();
            GZipStream zipStream = new GZipStream(ms, CompressionMode.Decompress);
            MemoryStream msReader = new MemoryStream();
            buffer = new byte[0x1000];
            while (true)
            {
                int read = zipStream.Read(buffer, 0, buffer.Length);
                if (read<0)
                {
                    break;
                }
                msReader.Write(buffer, 0, read);
            }
            zipStream.Close();
            ms.Close();
            msReader.Position = 0;
            buffer = msReader.ToArray();
            stateString = Convert.ToBase64String(buffer);
            return formatter.Deserialize(stateString);
        }
    }