using System;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Data;
using System.Data.SqlClient;

using Shivu;

public partial class ViewStateCompression : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            using (SqlConnection connection = new SqlConnection("server=shivu;database=NewAgencyProspect;uid=sa;pwd=ntplupl"))
            {
                connection.Open();
                using (SqlDataAdapter dataAdapter = new SqlDataAdapter("select * from AgencyProspects", connection))
                {
                    DataSet dataSet = new DataSet();
                    dataAdapter.Fill(dataSet);
                    ViewState["dataSet"] = dataSet.Tables[0].Rows.Count.ToString();
                }
            }
        }
        catch (Exception ex)
        {
            Trace.Write(ex.Message);
        }
    }

    protected override object LoadPageStateFromPersistenceMedium()
    {
        LosFormatter formatter = new LosFormatter();

        string viewState = Request.Form["__VSTATE"];
        byte[] bytes = Convert.FromBase64String(viewState);
        bytes = Compressor.Decompress(bytes);

        return formatter.Deserialize(Convert.ToBase64String(bytes));
    }

    protected override void SavePageStateToPersistenceMedium(object viewState)
    {
        try
        {
            LosFormatter formatter = new LosFormatter();
            StringWriter writer = new StringWriter();
            formatter.Serialize(writer, viewState);
            string viewStateString = writer.ToString();
            byte[] bytes = Convert.FromBase64String(viewStateString);
            bytes = Compressor.Compress(bytes);
            ClientScript.RegisterHiddenField("__VSTATE", Convert.ToBase64String(bytes));
        }
        catch (Exception ex)
        {
            Trace.Write(ex.Message);
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        string count = (string)ViewState["dataSet"];
    }
}

//Class

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

/// <summary>
/// Summary description for Compressor
/// </summary>
/// 
namespace Shivu
{
    public class Compressor
    {
        public static byte[] Compress(byte[] data)
        {
            MemoryStream output = new MemoryStream();
            try
            {
                GZipStream gzip = new GZipStream(output,
                                  CompressionMode.Compress, true);
                gzip.Write(data, 0, data.Length);
                gzip.Close();
            }
            catch (Exception ex)
            {
                Trace.Write(ex.Message);
            }
            return output.ToArray();
        }

        public static byte[] Decompress(byte[] data)
        {
            MemoryStream output = new MemoryStream();
            try
            {
                MemoryStream input = new MemoryStream();
                input.Write(data, 0, data.Length);
                input.Position = 0;
                GZipStream gzip = new GZipStream(input,
                                  CompressionMode.Decompress, true);
                
                byte[] buff = new byte[64];
                int read = -1;
                read = gzip.Read(buff, 0, buff.Length);
                while (read > 0)
                {
                    output.Write(buff, 0, read);
                    read = gzip.Read(buff, 0, buff.Length);
                }
                gzip.Close();
            }
            catch (Exception ex)
            {
                Trace.Write(ex.Message);
            }
            return output.ToArray();
        }

    }
}