DBGrid Key Violation

When editing a DBGrid and entering a duplicate value into a unique key field a 'Key Violation' error occurs. Is there anyway of trapping this error to provide a more user friendly message?
roblanAsked:
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javiertbCommented:
You could trap the error by means of OnPostError table event. There you can chose what to do and the database error you got.

Hope this helps.
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jmstoltingCommented:
..or handle the EKeyViolation exception directly :

 try
   TheTable.post;
 except
   MessageDlg('This key already exists!',mtWarning,[mbOk,0);
   TheTable.cancel; // remove the record
 end;
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