protected override void TearDown()
 {
     using (var dataContext = new PerformanceTestDataContext())
     {
         dataContext.Connection.Open();
         using (dataContext.Transaction = dataContext.Connection.BeginTransaction())
         {
             dataContext.Simplests.DeleteAllOnSubmit(dataContext.Simplests);
             dataContext.SubmitChanges();
             dataContext.Transaction.Commit();
         }
     }
 }
 protected override void OpenSession()
 {
     _db = new PerformanceTestDataContext();
     _db.Connection.Open();
 }