UniqueIdentifier not accepting nullvalue

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C#

Hi
UserID UniqueIdentifier filed

us.UserID = (Guid)reader["UserID"]; how i can check
null value plz help me

Posted 25-Mar-14 21:03pm

satheeshkumar chinnadurai

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Bernhard Hiller 26-Mar-14 3:14am

Where can that null value be - in your class, in the database, both?
Do you think it makes sense to use a UniqueIdentifier which can be null - what's the purpose of such an idea?

satheeshkumar chinnadurai 26-Mar-14 3:20am

Not UserID - CompanyID some where i am using null values some where assign value

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OriginalGriff · Answer 1 · 2014-03-25T21:20:00

Guid is a struct in .NET - which means it's a value type, and that can't hold null values.
If you have null Guids in your database - which is probably a poor idea - then you need to check the returned value against DBNull.Value when you pull it from the reader, and (probably) assign Guid.Empty to your UserID instead.