SQL Server nHibernate Config

/// <summary>
/// Get Factory
/// </summary>
/// <returns></returns>
private ISessionFactory CreateSessionFactory()
{
       return Fluently.Configure()
        .Database(MsSqlConfiguration.MsSql2012.ConnectionString(
             c => c.FromConnectionStringWithKey("ConnectionString")))
        .Mappings(m => m.FluentMappings.AddFromAssemblyOf<StockSymbols>())
        .Mappings(m => m.FluentMappings.AddFromAssemblyOf<StockQuotes>())
        .BuildSessionFactory();    
}