Tooltip for listbox items

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ASP.NET

Hi,

I want to display tooltip for each item in ListBox.

What I have tried:

for this I have added below code block in page preRender event:

for (var i = 0; i < ListBox.Items.Count;i++ )
                {
                    var item = ListBox.Items[i];
                    if (item.Attributes["title"] == null)
                    { 
                        item.Attributes.Add("title", item.ToString()); 
                    }
                }

It is adding title attribute for every item but only displays tooltip for the items which are below the selected item but not for the item which is above selected item.
means: if I have 4 items in listbox and I have selected 2nd item then I am only getting tooltip for 2,3 and 4th item and not for 1st item but the attribute title is present for item 1.
if we select first list item they I am getting tooltip for all the list items.