Описание тега sqlfilestream
SqlFileStream is a class that exposes SQL Server data that is stored with the FILESTREAM column attribute as a sequence of bytes.
The SqlFileStream class is used to work with varbinary(max) data stored with the FILESTREAM attribute in a SQL Server 2008 database. You must install the.NET Framework 3.5 SP1 (or later) to use System.Data.SqlTypes.SqlFileStream to work with FILESTREAM data.
Specifying the FILESTREAM attribute on a varbinary(max) column causes SQL Server to store the data in the local NTFS file system instead of in the database file. Transact-SQL statements provide data manipulation capabilities within the server, and Win32 file system interfaces provide streaming access to the data.