MVC Ajax did not hit the JSON Result method.

Question

Below jquery code getting error on IIS web server.

(when Browser debugging getting error Url: ../Home/handlers/?action=ping&sessionID=undefined) 

$(document).ready(function () {
       $('#ddlDB1').change(function () {
           $.ajax({
               type: "post",
               url: "/DataSource/TableList",
               data: { database: $('#ddlDB1').val() },
               datatype: "json",
               traditional: true,
               success: function (data) {
                   var district = '<option>Select Table Name</option>';
                   for (var i = 0; i < data.length; i++) {
                       district += "<option value='" + data[i].Value + "'>" + data[i].Text + "</option>";
                       //district = district + '<option value=' + data[i].Value + '>' + data[i].Text + '</option>';
                   }
                   //district = district + '</select>';
                   $('#ddltable1').html(district);
               }
           });
       });