Null Semantics
The following table provides links to various parts of the LINQ to SQL documentation where null (Nothing in Visual Basic) issues are discussed.
| Topic | Description |
|---|---|
| SQL-CLR Type Mismatches | The "Null Semantics" section of this topic includes discussion of the three-state SQL Boolean versus the two-state common language runtime (CLR) Boolean, the literal Nothing (Visual Basic) and null (C#), and other similar issues. |
| Standard Query Operator Translation | The "Null Semantics" section of this topic describes null comparison semantics in LINQ to SQL. |
| System.String Methods | The "Differences from .NET" section of this topic describes how a return of 0 from LastIndexOf might mean either that the string is null or that the found position is 0. |
| Compute the Sum of Values in a Numeric Sequence | Describes how the Sum operator evaluates to null (Nothing in Visual Basic) instead of 0 for a sequence that contains only nulls or for an empty sequence. |