Below are the two ways of passing data to server. The first one shows by using GET and the second by POST.

xmlHttpObj.open("GET","http://" + location.host +

"/XmlHttpExample1/WebForm1.aspx?value=123", true);

xmlHttpObj.open("POST","http://" + location.host +

"/XmlHttpExample1/WebForm1.aspx?value=123", true);