clarifying on __VIEWSTATE __EVENTVALIDATION __EVENTTARGET , __EVENTARGUMENT needed

[NGamer]

I am trying to achieve a successful POST to an ASPX page (an external site) using cURL.Since I don't care much for the looks of the page (it is all done on the server side), I am not sending ANY these arguments (\[code\]__VIEWSTATE __EVENTVALIDATION __EVENTTARGET , __EVENTARGUMENT\[/code\] ), not even empty, but I do send the real data.I would like to know how crucial it is to POST these arguments to the ASPX server?I am not an aspx programmer, but I might suspect that \[code\]__EVENTVALIDATION\[/code\] might give me some hard time here? or is this something between the browser and the server that I don't need to care much for?If this is crucial, how can I imitate these vars so the server accepts POSTS ?Thanks!