Below is My Code Find It var QUERY variables text hide i.e Red Colured text not shown in web server
function FillSemister() {
var ddlCOUSRSEID = document.getElementById("<%=ddlCOUSRSEID.ClientID %>");
var ddlCourseYearId = document.getElementById("<%=ddlCOURSEYEARID.ClientID %>");
var QUERY = "SELECT SEMISTER AS TEXT,SEMISTER AS VALUE FROM TBLCOURSEDETAILS WHERE COURSEID=" + ddlCOUSRSEID.value + " and YEAR=" + ddlCourseYearId.value + " ";
$.ajax({
url: '../Common.asmx/FillDDL',
data: "{ QUERY: '" + QUERY + "'}",
type: 'POST',