How to create OR statements for NHibernate?

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You’re looking for the Conjunction and Disjunction classes, these can be used to combine various statements to form OR and AND statements.

AND

.Add(
  Expression.Conjunction()
    .Add(criteria)
    .Add(other_criteria)
)

OR

.Add(
  Expression.Disjunction()
    .Add(criteria)
    .Add(other_criteria)
)

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