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POCalling web method from Jquery-Ajax ..Error:Internal Server Error
 

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  1. POCalling web method from Jquery-Ajax ..Error:Internal Server Error
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    <p>I am learning JQuery and today what I am making is a cascading dropdown (Country State and City).</p> <p>My code so far is as under</p> <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;Untitled Page&lt;/title&gt; &lt;script type="text/javascript" src="JQuery/jquery-1.6.1.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; $(document).ready(function() { $("#ddlCountry").change(function() { var CountryID = $("#ddlCountry option:selected").val(); $.ajax( { type: "POST", url: "CascadingDropDown.aspx/GetSelectedStates", data: "{countryID:'" + CountryID + "'}", contentType: "application/json; charset=utf-8", dataType: "json", success: function(data) { alert(data); }, error: function() { alert(arguments[2]); } }); }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;Country&lt;/td&gt; &lt;td&gt; &lt;asp:DropDownList ID="ddlCountry" runat="server"/&gt; &lt;/td&gt; &lt;td&gt;State&lt;/td&gt; &lt;td&gt; &lt;asp:DropDownList ID="ddlState" runat="server"/&gt; &lt;/td&gt; &lt;td&gt;City&lt;/td&gt; &lt;td&gt; &lt;asp:DropDownList ID="ddlCity" runat="server"/&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="2"&gt; &lt;asp:Button ID="btnSave" runat="server" Text="Save" /&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:Label ID="lblMessage" runat="server"&gt;&lt;/asp:Label&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The web method is as under</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web.Services; public partial class CascadingDropDown : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { PopulateCountry(); } } private void PopulateCountry() { DataSource ds = new DataSource(); ddlCountry.DataSource = ds.GetCountryList(); ddlCountry.DataValueField = "CountryCode"; ddlCountry.DataTextField = "CountryName"; ddlCountry.DataBind(); } [WebMethod] public List&lt;State&gt; GetSelectedStates(string countryID) { DataSource ds = new DataSource(); var stateList = ds.GetStateList(); var result = stateList.Where(i =&gt; i.CountryCode == countryID); return result.ToList&lt;State&gt;(); } } </code></pre> <p>But while I am choosing any country from the country drop down, I am getting <strong>"Internal Server Error".</strong></p> <p>Could anyone please help me in point out what mistake I am making and how to overcome this?</p>
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    1. COWhat happens under debugging? It's unlikely to be an AJAX/JSON problem, but probably an issue within your GetStateList() method?
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    2. COIt is not even reaching to that point... I have added break point into that method
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