##DbHug ##Async commands

Almost any DbHug execution method can be asynchronous. SelectAsync(...), InsertAsync(...), UpdateAsync(...), DeleteAsync(...), ExecScalarTransactionalAsync(...), ExecNonQueryTransactionalAsync(...), ExecProcedureOnAsync(...), etc.

ConnectionHug will create DbConnections to make several connections to database at same moment. But if ConnectionHug was instantiated not by DbCommand.

####Partials ... Caching