Exact duplicate of this question.
When You get an error in .Net application we got an a Stack Trace. For example
[ADOException: cannot open connection]
NHibernate.Impl.SessionFactoryImpl.OpenConnection() +153
NHibernate.AdoNet.ConnectionManager.GetConnection() +119
NHibernate.Impl.SessionImpl.get_Connection() +42
What does those digits mean?