Bind Listbox without postback after selected ComboBox

[Naunton]

Hi all,

I have a ComboBox and and ListBox.

After selected at ComboBox, get value from ComboBox and pull data from database then bind to listbox without postback.
How I to do please?
At which event I have to pull data for listbox ?

[Shinu]

Hello Naunt,

You can achieve the desired functionality by either using RadAjaxManager or RadAjaxPanel.

Please go through the following documentation for more on this,

AJAX Manager
AJAX Panel

Thanks
Shinu.

[Naunton]

Hi Shinu,

Could you please advise again?
I have bind listbox as the following at RadAjaxManager1_AjaxRequest event.

ListBox1.DataTextField = "Desc"
ListBox1.DataValueField = "ID"
ListBox1.DataSource = dt
ListBox1.DataBind()

Data didn't show out in ListBox1.

But when I look at Watch window like this   ListBox1.Items.count it shows me 5 , when I look detail  ListBox1.Items(0).text it shows "AAA".
So this mean data are already in Listbox, but just not show.

Please advise how I can show these data?
Here is my Listbox sourcecode

<telerik:RadListBox ID="ListBox1" runat="server" CheckBoxes="True"
            Skin="Default" Height="300px" >
        </telerik:RadListBox>

Please Help...

Thanks and best regard.

[Dimitar Terziev]

Hello Naunt,

With the code provided there shouldn't be any problem.

I've prepared a small example project showing how to populate listbox based on combobox item selection.

Best wishes,
Dimitar Terziev
the Telerik team

[Naunton]

Thanks million, for the example.
By reference your example, have found out that I made wrong AjaxSetting yesterday instead of must set "RadAjaxManager1" I set "RadCombo1".

The right must be..

<telerik:AjaxSetting AjaxControlID="RadAjaxManager1">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="ListBox1" />
                </UpdatedControls>
</telerik:AjaxSetting>

This is because of my wrong understanding on RadAjaxManager.

Thank you again for save my day..