Relational tables have six properties: • Values are atomic. • Column values are of the same kind. • Each row is unique. • The sequence of columns is insignificant. • The sequence of rows is insignificant. • Each column must have a unique name

Relational tables have six properties: 1. Values are atomic. 2. Column values are of the same kind. 3. Each row is unique. 4. The sequence of columns is insignificant. 5. The sequence of rows is insignificant. 6. Each column must have a unique name.

they must all use exactly the same connection string it is per-AppDomain for SSPI etc, the implicit user account must be common (i.e. the same domain user is being represented, or it will form multiple pools) it must be enabled and supported by the provider; in the case of SqlConnection it is on by default you must have not explicitly disabled the pool

refer my blog http://www.c-sharpcorner.com/Blogs/14067/acid-properties-of-sql-server.aspx