Find all columns based on a UNION

In the information schema tables of my SQL Server database I need to find a way to identify if a column is based on a union so when I do my bulk insert in .NET I don't map to this column...I already know how to identify the computed columns there.

Any suggestions would be awesome....
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jnordengConnect With a Mentor Author Commented:
select *from sys.computed_columns. See if it has a definition.
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