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change some text before it is sent to the client.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="InterceptHtml.aspx.cs"
Inherits="InterceptHtml" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Untitled Page</title>
</head>
<body>
   <form id="form1" runat="server">
       <div>
           Hello World!
           <br />
           Hi
       </div>
   </form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.IO;

public partial class InterceptHtml : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {

       Response.Filter = new ReplaceHTML(Response.Filter);


   }
   /// <summary>
   /// Second Method!!!!!!! overide the Render Method.
   /// </summary>
   /// <param name="writer"></param>
   protected override void Render(HtmlTextWriter writer)
   {


       StringWriter output = new StringWriter();
       base.Render(new HtmlTextWriter(output));
       writer.Write(output.ToString().Replace("Hi", "This is the replaced text!
Welcome to <a href=\"http://www.aspdotnetcodebook.blogspot.com\
">www.aspdotnetcodebook.blogspot.com</a>"));
   }
}
II nd Method
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// To intercept and get a reference to the HTML, we now need to create a
/// class to inherit System.IO.Stream. So, create a new class in
/// </summary>
public class ReplaceHTML : System.IO.Stream
{

    private System.IO.Stream Base;

    public ReplaceHTML(System.IO.Stream ResponseStream)
    {
        if (ResponseStream == null)
            throw new ArgumentNullException("ResponseStream");
        this.Base = ResponseStream;
    }






    public override int Read(byte[] buffer, int offset, int count)
    {
        return this.Base.Read(buffer, offset, count);
    }


    public override void SetLength(long value)
    {

    }

    public override void Write(byte[] buffer, int offset, int count)
    {
        // Get HTML code 
        string HTML = System.Text.Encoding.UTF8.GetString(buffer, offset, count);

        // Replace the text with something else 
        HTML = HTML.Replace("Hello World!", "I've replaced the Hello World example!");

        // Send output 
        buffer = System.Text.Encoding.UTF8.GetBytes(HTML);
        this.Base.Write(buffer, 0, buffer.Length);
    }

    public override bool CanRead
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override bool CanSeek
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override bool CanWrite
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override void Flush()
    {
        HttpContext.Current.Response.Flush();

    }

    public override long Length
    {
        get { throw new Exception("The method or operation is not implemented."); }
    }

    public override long Position
    {
        get
        {
            throw new Exception("The method or operation is not implemented.");
        }
        set
        {
            throw new Exception("The method or operation is not implemented.");
        }
    }

    public override long Seek(long offset, System.IO.SeekOrigin origin)
    {
        throw new Exception("The method or operation is not implemented.");
    }
}

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