what is sent by browser to server

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I am developing asp.net mvc application. I have an HTML Form containing - Labels, Text Boxes, Drop Down Lists and Web Grid(HTML Table).

When I Click on Update Button (i.e. use POST Method), what exactly is sent by browser to say IIS Web Server. If you can provide ACTUAL and ALL text contents (such as HTTP/1.1, content-length=123456, actual controls and their contents) as a text file and snapshot to me, it will really help me to improve my web development.

On Server side I use c#.net. From Server on wards, I have full understanding up to databases etc. I am quite familiar with JavaScript, jQuery, CSS3, jSON etc. I also know as to how to use model, fill data in a view and return view from controller.

With Kind Regards, Dilip Nagle