How to know document.forms['aspnetForm'].submit() make the submit at the server side?

[ryterompbil]

I use \[code\]document.forms['aspnetForm'].submit() \[/code\]to submit the form. There are other buttons doing some other things at the server side too. Is it possible at the server side, e.g, in Page_Load(object sender, EventArgs e), use some method to check client side called this\[code\]document.forms['aspnetForm'].submit() \[/code\]?thanks