[Firebird-net-provider] Multithread insert

[Геннадий З. <zab...@gm...>]

I'm trying to insert to database multiple items at once via following code:

using (var transaction =
act.Database.BeginTransaction(System.Data.IsolationLevel.RepeatableRead))
{
  // inserting and updating several related entities.
  act.SaveChanges() // Throws exception
}

Exception message:
lock conflict on no wait transaction
deadlock
update conflicts with concurrent update
concurrent transaction number is 665378

A problematic query that throws is about updating the entity, that all
my queries update.

Using any other IsolationLevel doesn't affect the behavior.