System.Data.Linq Namespace
The System.Data.Linq namespace contains classes that support interaction with relational databases in LINQ to SQL applications.
| 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 | This API supports the product infrastructure and is not intended to be used directly from your code. 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. |
| 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. |
| 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. |
| ITable(Of TEntity) | Represents a table for a particular type in the underlying database. |
| 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. |
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.