Unable to add empty item in combobox on prerender

[a.wilks]

I load a RadCombo box via a store procedure.  To that list I want to add an "All" item at position 0.

I tried doing it this way:

 

protected void rcbYear_PreRender(object sender, EventArgs e)
        {
            RadComboBox combo = sender as RadComboBox;
            if (ViewState[combo.ClientID] != null)
            {
                var rcbi = new RadComboBoxItem();
                rcbi.Attributes.Add("0", "All");
                combo.Items.Insert(0, rcbi);
                combo.DataBind();
            }
        }

I verified that when the combo box comes in has the values from the store proc.  The method runs normally but the combo ends with the same items as when it came in.

Any ideas?

[Ivana]

Hi Angela,

I have tried the following at my end, and it works just as is should. The item is added properly to the Items collection of RadComboBox.

<telerik:RadComboBox ID="RadComboBox1" runat="server">
    <Items>
        <telerik:RadComboBoxItem Text="1" />
        <telerik:RadComboBoxItem Text="2" />
    </Items>
</telerik:RadComboBox>

protected void Page_PreRender(object sender, EventArgs e)
{
    var rcbi = new RadComboBoxItem();
    rcbi.Attributes.Add("0", "All");
    rcbi.Text = "All";
    rcbi.Value = "All";
    RadComboBox1.Items.Insert(0, rcbi);
}

Let me know if I am missing something.

Kind regards,
Ivana
the Telerik team

[a.wilks]

It worked!  Thank you for the very fast reply.