Changing Asp.net form's attribute using Response.filter

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There are many ways to change the forms attribute and this is one of them ..

Here is the simple code for that ..

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;

using System.IO;

using System.Text.RegularExpressions;

public class cdsnetFormActionModifier : Stream

{

    private Stream _sink;

    private long _position;

    string _url;

    public cdsnetFormActionModifier(Stream sink, string url)

    {

        _sink = sink;

        _url = "$1" + url + "$3";

    }

    public override bool CanRead

    {

        get { return true; }

    }

    public override bool CanSeek

    {

        get { return true; }

    }

    public override bool CanWrite

    {

        get { return true; }

    }

    public override long Length

    {

        get { return 0; }

    }

    public override long Position

    {

        get { return _position; }

        set { _position = value; }

    }

    public override long Seek(long offset, System.IO.SeekOrigin direction)

    {

        return _sink.Seek(offset, direction);

    }

    public override void SetLength(long length)

    {

        _sink.SetLength(length);

    }

    public override void Close()

    {

        _sink.Close();

    }

    public override void Flush()

    {

        _sink.Flush();

    }

    public override int Read(byte[] buffer, int offset, int count)

    {

        return _sink.Read(buffer, offset, count);

    }

    public override void Write(byte[] buffer, int offset, int count)

    {

        string s = System.Text.UTF8Encoding.UTF8.GetString(buffer, offset, count);

        Regex reg = new Regex("(<form.*action=\")([^\"]*)(\"[^>]*>)", RegexOptions.IgnoreCase);

        Match m = reg.Match(s);

        if (m.Success)

        {

            string form = reg.Replace(m.Value, _url);

            int iform = m.Index;

            int lform = m.Length;

            s = s.Substring(0, iform) + form + s.Substring(iform + lform);

        }

        byte[] yaz = System.Text.UTF8Encoding.UTF8.GetBytes(s);

        _sink.Write(yaz, 0, yaz.Length);

    }

}

 

And configure your load event of any page you want like below

  protected void Page_Load(object sender, EventArgs e)
    {
        this.Response.Filter = new cdsnetFormActionModifier(this.Response.Filter, "your_url");
    }