Searching Combobox to see if string exists

I have a dbcombobox with a items list of authors. If the text the user enters is not an author already in the combobox list I want to be able to add it to the list (without getting multiple entries for the same author).
JohnEAsked:
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erajojConnect With a Mentor Commented:
Easiest way (case insensitive):

AlreadyThere := (ComboBox.Items.IndexOf(NewEntry)<>-1);
if not AlreadyThere then begin
  ComboBox.Items.Add(NewEntry)
end;

/// John

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sassas081597Commented:
Hi!
Pls, Say what you really need:
1) The procedure which compares New Author and all other Autors before Post an Author or
2) the same but while the user types smth in the box?
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