The object represents a SQL Server database mapping.
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 object. Every login has a database mapping for each database that it can access.
Any public static (Shared in Microsoft Visual Basic) members of this type are safe for multithreaded operations. Any instance members are not guaranteed to be thread safe.