How to do a one-to-one relationship with null in NHibernate?

How to do a one-to-one relationship with null in NHibernate?

References

Reference NO 1

http://stackoverflow.com/questions/15194359/how-to-do-a-one-to-one-relationship-with-null-in-nhibernate

Reference NO 2

http://stackoverflow.com/questions/4643373/nhibernate-nullable-one-to-one-association

Reference NO 3

http://stackoverflow.com/questions/2991097/how-to-do-this-unidirectional-nhibernate-one-to-one-mapping

Reference NO 4

http://stackoverflow.com/questions/4660160/map-one-to-one-relationship-doesnt-allow-inserting

Reference NO 5

http://stackoverflow.com/questions/8152707/nhibernate-many-to-one-parent-is-always-null-on-insert

Reference NO 6

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Reference NO 7

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Reference NO 8

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