First of all, the only post (calling-multiple-dopostback-from-javascript) I found about this didn\'t help my problem, so I don\'t belive this post is a duplicate.
I
I have used multiple parameters before by building and splitting a string.
eg
string args = String.Format("{0};{1}", bolID, ControlID);
You can then pass this in to the arguments for the postback, and when checking for the postback arguments just split the string based on your speration character (in this case ';')