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        protected override void SavePageStateToPersistenceMedium(object state)
        {
            LosFormatter formatter = new LosFormatter();
            StringWriter writer = new StringWriter();
            //write uncompressed viewstate
            formatter.Serialize(writer, state);
            //get uncompressed viewstate as string
            string viewState = writer.ToString();
            //convert uncompressed viewstate into byte[]
            byte[] data = Convert.FromBase64String(viewState);
            //get compressed data
            byte[] compressedData = ViewStateHelper.Compress(data);
            //convert compressed byte[] into string
            string str = Convert.ToBase64String(compressedData);
            ClientScript.RegisterHiddenField("__MYVIEWSTATE", str);

        }

        protected override object LoadPageStateFromPersistenceMedium()
        {
            //get compressed viewstate
            string viewstate = Request.Form["__MYVIEWSTATE"];
            //convert to byte[]
            byte[] data = Convert.FromBase64String(viewstate);
            //decompress data
            byte[] uncompressedData = ViewStateHelper.Decompress(data);
            //convert byte[] to base64 string
            string str = Convert.ToBase64String(uncompressedData);
            LosFormatter formatter = new LosFormatter();
            return formatter.Deserialize(str);
        }

using System.IO;
using System.IO.Compression;

public class ViewStateHelper
{

    public static byte[] Compress(byte[] data)
    {
        MemoryStream ms = new MemoryStream();
        GZipStream stream = new GZipStream(ms, CompressionMode.Compress);
        stream.Write(data, 0, data.Length);
        stream.Close();
        return ms.ToArray();
    }

    public static byte[] Decompress(byte[] data)
    {
        MemoryStream ms = new MemoryStream();
        ms.Write(data, 0, data.Length);
        ms.Position = 0;
        GZipStream stream = new GZipStream(ms, CompressionMode.Decompress);
        MemoryStream temp = new MemoryStream();
        byte[] buffer = new byte[1024];
        while (true)
        {
            int read = stream.Read(buffer, 0, buffer.Length);
            if (read <= 0)
            {
                break;
            }
            else
            {
                temp.Write(buffer, 0, buffer.Length);
            }
        }
        stream.Close();
        return temp.ToArray();
    }
}