Nvarchar Question

I have an asp page that updates a ms sql 2k db.

If put a name in a db field of 12 characters should the nvarchar length be
set to 24 to allow for double byte characters.

Should I be using nvarchar or char as when i make my input field length in
asp page 12 the insert fails but if i make it 3 or 4 it works ok even though
the db field length is set to same as asp field length.

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