sending files AND informations by POST in C#

Question

Hey peeps, im lost in this one: I need to send image thru POST method to the php script waiting on the other side, but i need to send another informations with it too, such as send the file and send info about uploader with it... Everything I've found so far is a way how to upload a file, OR how to send informations, but I need to send them together (the script receives the file with another informations about it). Thanks in advance, Soap.