var id = "#" + dropdownchangeid;
var obj = {};
obj.userid = userid;
obj.chartid = chartid;
obj.filterid = filterid;
obj.columname = name;
obj.sel = selecttext
$.ajax({
url: "webmethod.aspx/dropdownonchange",
data: JSON.stringify(obj),
dataType: "json",
type: "POST",
contentType: "application/json; charset=utf-8",
success: function(r) {
var ddlmachine = $("[id*='" + dropdownchangeid + "']");