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asp.net c#, jquery, webmethod

Last Modified: 2016-10-09
I have jquery and I try to map with webmethod written in c#. but do not know what to do....with dictionary c#.
Please helps

<select  id="PRODUCT_LIST" name="PRODUCT_LIST"> should show up
<option value="1">1000</option>
<option value="2">2000</option>


<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Tester5.aspx.cs" Inherits="AppService.Tester5" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<select onchange="ShowList()" runat="server" required class="form-control" id="PRODUCT_CODE" name="PRODUCT_CODE">
                                                                    <option value="" disabled="disabled" selected="selected" class="disabled">Product Code</option>  
                                                                    <option value="13081">13081</option>  
                                                                    <option value="13082">13082</option>                                            
<br />
<select  onchange="ShowList()"  runat="server" required class="form-control" id="PRODUCT_STATE" name="PRODUCT_STATE">
                                                                    <option value="" disabled="disabled" selected="selected" class="disabled">Product State</option>  
                                                                    <option value="ND">ND</option>        
                                                                    <option value="OH">OH</option>                                                                                                                
                                                                    <option value="ZZ">All Others</option>                                            
<br />  
<select style="display:none;"  runat="server" required class="form-control" id="PRODUCT_LIST" name="PRODUCT_LIST"></select>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript"></script>
<script type = "text/javascript">
    function ShowList() {
                type: "POST",
                url: "Tester5.aspx/GetList",
                data: '', //?
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: OnSuccess,
                failure: function (response) {
    function OnSuccess(response) {

//code behind:

        public static Dictionary<string,string>GetList(string PRODUCT_CODE, string PRODUCT_STATE)
            Dictionary<string,string> s = new Dictionary<string,string>();
            s.Add("1", "1000");
            s.Add("2", "2000");
            return s;
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