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How to check value(if it is null or not) in Process Request

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From my search After Go button is pressed I will click on particular record to navigate to main page, But I need to check a NULL validation at this point , If a particular coulmn is null then I need to render it false.
My column type is BLOB.

Can any one suggest me how to find if that column is NULL or NOT.


Edited by: user8996062 on Aug 25, 2010 10:35 AM
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