O

object identity, unique, 131

object initialization

anonymous types, 46–48

C# support, 42–46

nested, 44, 57

projections, 141–142

storing query results, 49

Visual Basic support, 56–58

object references, 5, 131

Object Relational Mapping (ORM), 164

object type

enumeration support, 27

extension methods, 39

local type inference, 53

objects, 15, 59.

See also LINQ to Objects

ObjectTracking property (DataContext), 151, 154

ODBC (Open Database Connectivity), 1

OfType operator, 122, 130

OLAP, 17

one-to-many relationship, 132

Open Database Connectivity (ODBC), 1

operations, timing of, 4

operators. See specific types of operators

Option Infer Off (Visual Basic), 54

Option Infer On (Visual Basic), 54

Option Strict Off (Visual Basic), 52–53

Option Strict On (Visual Basic), 53–54

OrderBy method, 4, 83

OrderBy operator, 49, 60, 81

OrderByDescending operator, 81

ordering operators, 80–84

ORM (Object Relational Mapping), 164

OtherKey property, 134, 138

outer equijoin, 89

OverflowException error, 99

overloaded methods, 30, 39