Populate RadCombo with webmethod and jquery

[Wired_Nerve]

I have been digging around a bit looking for a good example of how to take a radcombobox and populate it using a webmethod and jquery combined... I think I am just missing something rather simple.. Any suggestions?

This is NOT a mvc project, but a traditional asp.net web forms

// This cancels the default RadComboBox behavior
function itemsRequesting(sender, args) {
    if (args.set_cancel != null) {
        args.set_cancel(true);
    }
    if (sender.get_emptyMessage() == sender.get_text())
        sender.set_text("");
}

function getSites(sender, args) {
    var url = baseUrl + "TagManagement/Tags.aspx/GetSiteList";

    $.ajax({
        async: false,
        type: "POST",
        url: url,
        data: "{}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            if (msg.d == null) {
                alert("The filter set returned no records");
                } else {

                fillCombo(sender, msg);

            }
        }
    }).complete(function () {
        $.unblockUI();

    });

return false;

}

function fillCombo(combo, result) {
    combo.clearItems();

    var items = result.d || result;

    // This just lets user know that nothing was returned with their search
    if (items.length == 0) {
        var comboItem = new Telerik.Web.UI.RadComboBoxItem();
        comboItem.set_text("Nothing found");
        comboItem.set_value("null");
        combo.get_items().add(comboItem);
        combo.set_text("");
    }

    for (var i = 0; i < items.length; i++) {
        var item = items[i];

        var comboItem = new Telerik.Web.UI.RadComboBoxItem();
        comboItem.set_text(item.Text);
        comboItem.set_value(item.Value);
        combo.get_items().add(comboItem);
    }
}

The Control :

<telerik:RadComboBox ID="RadComboBoxTransferSites" runat="server" CheckBoxes="true" EnableLoadOnDemand="true" OnClientItemsRequesting="getSites"
                                  EnableCheckAllItemsCheckBox="true" DataTextField="SiteName" DataValueField="SiteUID"
                                  EmptyMessage="Please Select...">
                              </telerik:RadComboBox>

The web method:

[WebMethod]
public static List<SiteList> GetSiteList()
{
    var siteList = (List<SiteList>)HttpContext.Current.Session["SiteList"];
    return siteList.ToList();
}

[Wired_Nerve]

I finally got this to work.

[Lokesh]

Can you please post working code here??

Thanks in advance.

[Cindi]

I also facing the same issue. can you help me in solving the above issue.

[Wired_Nerve]

There are several moving parts here.. What are you needing help with?