Compress ViewState and remove whitespace from HTML Using baseclass

1. Create Compressor class
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.IO.Compression;
using System.IO;
public static class Compressor
{
    public static byte[] Compress(byte[] data)
    {
        MemoryStream output = new MemoryStream();
        GZipStream gzip = new GZipStream(output, CompressionMode.Compress, true);
        gzip.Write(data, 0, data.Length);
        gzip.Close();
        return output.ToArray();
    }

    public static byte[] Decompress(byte[] data)
    {
        MemoryStream input = new MemoryStream();
        input.Write(data, 0, data.Length);
        input.Position = 0;
        GZipStream gzip = new GZipStream(input, CompressionMode.Decompress, true);
        MemoryStream output = new MemoryStream();
        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();
        return output.ToArray();
    }
}
----------------------------------------------

2. create BaseClass 

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.IO;

using System.Text.RegularExpressions;

using System.Collections.ObjectModel;

public class BaseClass : Page

{

    private static readonly Regex RegexBetweenTags = new Regex(@">(?! )\s+", RegexOptions.Compiled);

    private static readonly Regex RegexLineBreaks = new Regex(@"([\n\s])+?(?<= {2,})<", RegexOptions.Compiled);

    protected override object LoadPageStateFromPersistenceMedium()

    {

        string viewState = Request.Form["__VSTATE"];

        byte[] bytes = Convert.FromBase64String(viewState);

        bytes = Compressor.Decompress(bytes);

        LosFormatter formatter = new LosFormatter();

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

    }

    protected override void SavePageStateToPersistenceMedium(object viewState)

    {

        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));

    }

    protected override void Render(HtmlTextWriter writer)

    {

        using (HtmlTextWriter htmlwriter = new HtmlTextWriter(new System.IO.StringWriter()))

        {

            base.Render(htmlwriter);

            string html = htmlwriter.InnerWriter.ToString();

            html = Regex.Replace(html, @"(?<=[^])\t{2,}|(?<=[>])\s{2,}(?=[<])|(?<=[>])\s{2,11}(?=[<])|(?=[\n])\s{2,}", string.Empty);

            writer.Write(RemoveWhitespaceFromHtml(html));

        }

    }

    public static string RemoveWhitespaceFromHtml(string html)

    {

        html = RegexBetweenTags.Replace(html, ">");

        html = RegexLineBreaks.Replace(html, "<");

        return html.Trim();

    }

}

----------------------------------------------

3. Now crate a page and used 

public partial class portal : BaseClass instand of public partial class portal : System.Web.UI.Page

How to masking in SQL server

CREATE  FUNCTION [dbo].[fn_text_masking]
(
 @in_input VARCHAR(MAX),
 @in_mask_len INT
)
RETURNS VARCHAR(MAX)
AS
BEGIN
 DECLARE @mask_text VARCHAR(MAX), @mask_char VARCHAR(20)
 SET @mask_char = 'XXXXXXXXXXXXXXXXXXXX'

 SELECT @mask_text = REPLACE(@in_input, SUBSTRING(@in_input, 1, LEN(@in_input) - @in_mask_len),
SUBSTRING(@mask_char, 1, LEN(@in_input) - @in_mask_len))

 RETURN @mask_text
END
------------------------------------------------
SELECT dbo.fn_text_masking('123456789',4)