How can I change the Input request stream

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IIS7

C++

C#

ASP.NET

IIS

Detail is:

I want to replace the 'Text 1' in the Input stream to 'Text 2'

The first: I use the Request.Filter as http://msdn.microsoft.com/en-us/library/system.web.httprequest.filter.aspx But this way I can only replace a byte data by an other byte, I can not replace a string by a string and I also can not change buffer size. I need to access and replace the old buffer by an other byte array (content and buffer.length)

The second: I try to use a ISAPI Filter, but It seem that the IIS 7 and above is no longer support for SF_NOTIFY_READ_RAW_DATA. I google and result is I should write a native HttpModule with CHttpModule::OnReadEntity event. Is it right ?

I would be very appreciate if you can tell me how I can change the input request stream.

Thank you very much.

Huy