IT:AD:EF:HowTo:Build up queries progressively using AND and OR statements

Building up Query filters in parts, using AND/OR, is actually a lot trickier than it looks due to the expression being evaluated in Code rather than EF.

See: statements

The answer that works (used in NAB project) is expressed here:

• http://blogs.msdn.com/b/meek/archive/2008/05/02/linq-to-entities-combining-predicates.aspx
• http://nuget.org/packages/netfx-System.Linq.Expressions.ExpressionCombiner
• http://www.albahari.com/nutshell/predicatebuilder.aspx