RadComboBox Auto Complete Problem

[Syed]

I want to bind states combo box based on which country is selected but when i try to do that programmatically i get the following error
"There is no assigned data source. Unable to complete callback request."

Here is my code

<telerik:RadComboBox ID="ddlState" runat="server" AllowCustomText="true" MaxHeight="100px" EnableAutomaticLoadOnDemand="true"></telerik:RadComboBox>

    public void fillState(long countryId)
    {
        g_frontendDataContext fdc = new g_frontendDataContext();
        try
        {
            var states = from i in fdc.tbl_sfl_states
                         where i.fk_country_id == countryId
                         select new
                         {
                             stateId = i.pk_state_id,
                             stateName = i.state_name
                         };
            ddlState.DataSource = states.ToList();
            ddlState.DataBind();
            ddlState.DataTextField = "stateName";
            ddlState.DataValueField = "stateId";
            fdc.Dispose();
        }
}

[Ivana]

Hi Syed,

Make sure the RadComboBox control gets populated successfully.  For more information about different load on demand modes, you could refer to the following online demo: RadComboBox / Load on Demand modes.

You could also refer to the Related RadComboBoxes demo, to see how a related RadComboBoxes scenario is achieved.

I hope this helps.

All the best,
Ivana
the Telerik team