$(document).ready(function() {
    $("#drpIndustry2").bind("click", function() {
        if ($("#drpIndustry2").val() != "") {
            $("#drpConstituteIndustry2").val("");
        }
    });
    $("#drpConstituteIndustry2").bind("click", function() {
        if ($("#drpConstituteIndustry2").val() != "") {
            $("#drpIndustry2").val(""); ;
        }
    });
})