This is for SQL Server 2005. There are updated versions of the table for SQL Server 2008, SQL Server 2008 R2, SQL Server 2012 and SQL Server 2014.
SQL Server Data Types and Their .NET Framework Equivalents
The following table lists Microsoft SQL Server data types, their equivalents in the common language runtime (CLR) for SQL Server in the System.Data.SqlTypes namespace, and their native CLR equivalents in the Microsoft .NET Framework.
SQL Server data type | CLR data type (SQL Server) | CLR data type (.NET Framework) |
---|---|---|
varbinary | SqlBytes, SqlBinary | Byte[] |
binary | SqlBytes, SqlBinary | Byte[] |
varbinary(1), binary(1) | SqlBytes, SqlBinary | byte, Byte[] |
image | None | None |
varchar | None | None |
char | None | None |
nvarchar(1), nchar(1) | SqlChars, SqlString | Char, String, Char[] |
nvarchar | SqlChars, SqlString | String, Char[] |
nchar | SqlChars, SqlString | String, Char[] |
text | None | None |
ntext | None | None |
uniqueidentifier | SqlGuid | Guid |
rowversion | None | Byte[] |
bit | SqlBoolean | Boolean |
tinyint | SqlByte | Byte |
smallint | SqlInt16 | Int16 |
int | SqlInt32 | Int32 |
bigint | SqlInt64 | Int64 |
smallmoney | SqlMoney | Decimal |
money | SqlMoney | Decimal |
numeric | SqlDecimal | Decimal |
decimal | SqlDecimal | Decimal |
real | SqlSingle | Single |
float | SqlDouble | Double |
smalldatetime | SqlDateTime | DateTime |
datetime | SqlDateTime | DateTime |
sql_variant | None | Object |
User-defined type(UDT) | None | user-defined type |
table | None | None |
cursor | None | None |
timestamp | None | None |
xml | SqlXml | None |