Assembly: Microsoft.SqlServer.Smo (in microsoft.sqlserver.smo.dll)
A login allows access to SQL Server though it does not allocate permissions at a database level. Each login requires mapping to a database user within each database. The information about each mapping is stored in the DatabaseMapping object. Every login has a database mapping for each database that it can access.
This namespace, class, or member is supported only in version 2.0 of the Microsoft .NET Framework.