how can I don't assign a foreign key in asp?

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Hi, I have class that has a foreign key, where i define an object from it and insert in db i don't assign foreign key because it must assign in another page and i assign foreign key to null but I get this error:

Cannot insert the value NULL into column 'GdtStdUN', table 'HomeWorkSystem.dbo.Course'; column does not allow nulls. INSERT fails. The statement has been terminated.

thank you

Posted 28-May-12 22:51pm

parisa heidari

Updated 28-May-12 22:54pm

m@dhu

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Sandeep Mewara · Accepted Answer · 2012-05-28T23:26:00

where i define an object from it and insert in db i don't assign foreign key because it must assign in another page and i assign foreign key to null but I get this error
Defining a Foreign Key puts a foreign key constraint on that column. Looks like this constraint has been defined as having NOT NULL value right now, hence the error. You have to define it as NULL allowed to reference it later.

Details here: MSDN: FOREIGN KEY Constraints[^]
MSDN: Creating and Modifying FOREIGN KEY Constraints[^]