Problem calling Web Service using the DynamicPopulate Extender - Web Service Call Fails: 500

Hi, I'm quite new to ASP.Net AJAX so please forgive my ignorance.

 I have downloaded and installed the RC1 version and am following through some of the tutorial videos.

 I am having a problem with the Dynamic Populate Extender example.  I have created some asp controls with onclick events calling a javascript function.  From there I am attempting to use a dynamic populate extender control to call a web service - it's a function declared on that ASPX page as the tutorial explains in necessary and decorated with the System.Web.Services.WebMEthod AND System.Web.Script.Services.ScriptMethod attributes.

 Everything works as expected until I attempt to pass a parameter to the web services - in fact until I declare the web service function with a parameter. Once I do this, all that is returned to (or at least all that displays in) the control linked to the DynamicPopulateExtender is "Web Service Call Failed: 500".

Can anyone possibly put me on the right track here? (or would I need to post some code examples?)

 Thanks in Advance.


1/20/2007 11:17:10 AM 17816 articles. 1 followers. Follow

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the tutorial is in beta version.

i will post my code for you

ASPX page

 <%@ Page Language="C#" AutoEventWireup="true" Codebehind="Default.aspx.cs" Inherits="DynamicPopulateDemo._Default" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head runat="server">
    <title>Untitled Page</title>

    <form id="form1" runat="server">
     <script  type="text/javascript">

    function updateDateKey(value) {

        var behavior = $find('dpe');

        if (behavior) {



        <asp:ScriptManager ID="ScriptManager1" runat="server">
        <cc1:DynamicPopulateExtender ID="dpe" runat="server" ClearContentsDuringUpdate="true"
            PopulateTriggerControlID="Label1" TargetControlID="pan" ServiceMethod="GetHtml">
        <asp:Label ID="Label1" runat="server" Text="Label" CssClass="subheading">Time at the server:</asp:Label> 
  Choose a date/time format:<p>
            <label for="r0"><input type="radio" name="rbFormat" id="Radio1" value='G' onclick="updateDateKey(this.value);" checked="checked" />Normal</label><br />
            <label for="r1"><input type="radio" name="rbFormat" id="Radio2" value='d' onclick="updateDateKey(this.value);" />Short Date</label><br />
            <label for="r2"><input type="radio" name="rbFormat" id="Radio3" value='D' onclick="updateDateKey(this.value);" />Long Date</label><br />
            <label for="r3"><input type="radio" name="rbFormat" id="Radio4" value='U' onclick="updateDateKey(this.value);" />UTC Date/Time</label><br />
        <br />

        This time is dynamically formatted and<br /> returned as HTML from the server:

        <asp:Panel ID="pan" runat="server" BorderColor="#404040" BorderStyle="Solid" BorderWidth="1px" Height="15px" HorizontalAlign="Center" Width="380px">





using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace DynamicPopulateDemo
    public partial class _Default : System.Web.UI.Page
        protected void Page_Load(object sender, EventArgs e)
        public static string GetHtml(string contextKey)
            string value = string.Empty;

            if (contextKey == "U")
                value = DateTime.UtcNow.ToString();
                value = String.Format("{0:" + contextKey + "}", DateTime.Now);
            return String.Format("<span style='font-family:courier new;font-weight:bold;'>{0}</span>", value);



James Wu (MIB426)
.NET is only way to go
1/20/2007 3:55:40 PM

Thankyou very much for posting this code.

I have worked through the differences between your version of the tutorial and the code I was trying to get running.  It all boiled down to the name of the parameter on the web service method. I don't understand this yet but if I call the parameter on my web service method, "contextKey" it works, if I call it anything else, it fails.

Is anyone able to shed some light on this for me?


1/20/2007 11:27:55 PM

In the documentation it states that the paramater must be a string named contextKey


string DynamicPopulateMethod(string contextKey) { ... }

Note you can replace "DynamicPopulateMethod" with a naming of your choice, but the return type and parameter name and type must exactly match, including case.

2/6/2007 10:04:35 AM

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