How can DBNull not equal DBNull?

I think you problem is that in fact DBNull. Value == null //is always false The DBNull is a special class for comparisons on values returned from the dB so you actualy need to check for a null condition AND a DBNull. Value if your array contains both.

EDIT: Sorry looking closer at your code you may just need to reverse your OR operation. If o == null your first statement will blow up with your exception. Try: if (o!

= null || o == DBNull. Value).

Not if o == null... – Thomas Levesque Jan 14 '10 at 15:57.

May be such comparison helps if (!o.GetType(). Equals( DBNull. Value ) ) or if (o is DBNull).

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