Updated: November 2007

LINQ to SQL is a technology that provides a run-time infrastructure for managing relational data as objects. For more information, see LINQ to SQL.

 Classes

	Class	Description
	Binary	Represents an immutable block of binary data.
	ChangeConflictCollection	Returns a collection of objects involved in concurrency conflicts.
	ChangeConflictException	Thrown when an update fails because database values have been updated since the client last read them.
	ChangeSet	Provides a container to hold changes.
	CompiledQuery	Provides for compilation and caching of queries for reuse.
	DataContext	Represents the main entry point for the LINQ to SQL framework.
	DataLoadOptions	Provides for immediate loading and filtering of related data.
	DBConvert	Infrastructure. Used internally to convert one type to another.
	DuplicateKeyException	Thrown when an attempt is made to add an object to the identity cache by using a key that is already being used.
	EntitySet<(Of <(TEntity>)>)	Provides for deferred loading and relationship maintenance for the collection side of one-to-many and one-to-one relationships in a LINQ to SQL applications.
	ForeignKeyReferenceAlreadyHasValueException	Represents errors that occur when an attempt is made to change a foreign key when the entity is already loaded.
	MemberChangeConflict	Represents a situation in which an attempted update fails because member values have been updated since the client last read them.
	ObjectChangeConflict	Represents an update attempt with one or more optimistic concurrency conflicts.
	Table<(Of <(TEntity>)>)	Represents a table for a particular type in the underlying database.

 Structures

	Structure	Description
	EntityRef<(Of <(TEntity>)>)	Provides for deferred loading and relationship maintenance for the singleton side of a one-to-many relationship in a LINQ to SQL application.
	Link<(Of <(T>)>)	Used to enable deferred loading of individual properties (similar to EntityRef<(Of <(TEntity>)>)).
	ModifiedMemberInfo	Holds values of members that have been modified in LINQ to SQL applications.

 Interfaces

	Interface	Description
	IExecuteResult	Provides access to the return value or results of executing a query.
	IFunctionResult	Provides access to the return value of a function.
	IMultipleResults	Represents the results of mapped functions or queries with variable return sequences.
	ISingleResult<(Of <(T>)>)	Represents the result of a mapped function that has a single return sequence.
	ITable	Used for weakly typed query scenarios.

 Enumerations

	Enumeration	Description
	ChangeAction	Describes the type of change the entity will undergo when changes are submitted to the database.
	ConflictMode	Specifies when concurrency conflicts should be reported.
	RefreshMode	Defines how the Refresh method handles optimistic concurrency conflicts.