Large DropDown Scrolling List

We have dropdown on ASP page. The problem is we have about 900 items in the
dropdown. Users scrolling through the list have become very frustrated in
the past.

Can someone suggest if there is another way of implement a dropdown where
the datalist is as big as ours.

I am looking for something like a listbox in VB where you can start typing
the characters and the databelow moves accordingly until you have found what
you want.

Is there anything in ASP/HTML to achieve a similar functionality.