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How allow items in combobox/dropdownlist that aren't in the list

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I am converting an Access database to an ASP web page.  One field contains a list of people. I want the dropdown to only contain certain people, but there is already allot of names that are not those certain people.  I want to allow the old data to stay in the database, but any new ones, or if they edit and change the current name, I want it to have to be in the list, but if they don't change it the name, I don't want it to throw an error.

   I have my SelectedValue='<%#bind("RequestedBy")%>'.  

If the data in the database is in the list, it works fine.

If the data in the field is not in the list, I get an error, because combobox has a selectedvalue which is invalid because it does not exist in the list of items.

How do I just ignore it if the name isn't in the list? I want the name to stay in the box, even if its not in the list. Only if I try to change it, do I want to have to choose from an item in the list.


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