I know its an old post . But I stumbled upon it as I was looking for some solution to my problem. I found that in oracle DB  if uou try to update a non -null coulmn with a string which has a value  set to string.empty, oracle returns an error "cannot insert Null in ...column. so I have to explicitly set the value=" " and then do the insert , and it works fine !
So i am guessing same problem may happen in comparsion as well wherin string.empty may not be working as expected

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Hi,

ADO.net should be the right group for this question. :) Thanks.

Best regards,
Yanhong Huang
Microsoft Community Support

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