Are you using RadListBox for ASP.NET AJAX?
RadListBox for ASP.NET AJAX does not contain properties such as Rows and TextMode.
With respect to your question, RadListBox can have only one selected value. This means, that if you have 3 selected items, the SelectedValue property will return the value of the firstselected item. If you want to grab the values of all selected items, you can iterate over the ListItems and grab those that are selected.
You can use the RadListBox1.FindItemByValue
method in order to search for an item with a given value. Then you can use its Selected
property to select it.
the Telerik team