Well there isn't any built-in functionality to do this.  The easiest way I can think of is go back to the datasource and rebind the sorted results with the new value added.  Or if your datasource was originally a DataTable, this is a snap if you add the new item, then manipulate a DataView to show you the sorted results.  If you don't want to do that, I guess you could probably do a little bubble sort on the listbox items.

--Michael

The ListBox's Items collection has an Insert() method that takes the index at which you want to insert an item and either a ListItem object or a string object.  If you want to add an item that appears at the top of the list, just do this:

listbox.Items.Insert(0, "Select an Option")

Or you can do this:

Dim li As New ListItem("X", "Select and Option")
listbox.Items.Insert(0, li)

Of course, you could insert the item at any valid index.  If you have 10 items, you would not use index 15, of course (I have not tried that, so I do not know if it would throw an exception or just stick the item at the bottom of the list).

John

As for sorting, here is how I handle all lists:

I have a table in the database called Lists.  It has these fields: ListName, ValueMember, DisplayMember, SortOrder.  Let's say I want a list of delivery methods including UPS, FexEx, and US Mail, in that order.  I would have three entries, each with the ListName column having "Delivery Methods", and the SortOrder field specifying how they should appear sort-wise.

I have a dataset with the Lists table as a DataTable.  But when I want to use a list, I add a DataView to the page and specify its table as the Lists table, the RowFilter="ListName = 'Delivery Methods'" and SortOrder in the Sort property.  I then bind the list to the DataView rather than the DataTable.  This sorts the list exactly as I want it.

John

ArrayList al=new ArrayList();
                  foreach(ListItem li in this.ListBox1.Items)
                  {
                        al.Add(li.Text);
                  }
                  
                  al.Sort();
                  this.ListBox1.DataSource=al;
                  this.DataBind();

http://www.csharphelp.com/archives2/archive445.html see if that helps...

Thanks a lot.