RadListBox doesn't highlight the selected line

[deng bruce]

as:
{
   listBox.DataSource = m_dtRequisition;
   listBox.DisplayMember = "FileName";
   listBox.ValueMember = "RequisitionGuid";
}




when i should select the last index for radlistbox,  but why the listbox doesn't highlight the selected line? 
{
   DataTable dt = listBox.DataSource as DataTable;
   listBox.selectedindex = dt.Rows.Count;
}

[deng bruce]

It is ok as

 DataTable dt = listBox.DataSource as DataTable;
                if (dt.Rows.Count > 0)
                {
                    listBox.SelectedIndex = dt.Rows.Count - 1;
                }

[Peter]

Hello deng,

Thank you for the writing.

Indeed, in order to select the last item, you should set the SelectedIndex to the Count minus one. I am glad that you have found the answer to the question.

I would like to let you know that RadListBox control is obsolete since Q2 2010. Once we release Q2 2011, this control will no longer be supported. This is why, it is highly recommendable to upgrade to its ancestor - RadListControl.

Best wishes,
Peter
the Telerik team