Transaction isolation level can't be changed while a transaction

[lonegunman]

Hello,

The exception keep occuring randomly, like (http://forums.devart.com/viewtopic.php?t=16471). I've capture a dump, it shows that none of 5 connections in connection pool has transaction. My exception stacktrace is:
> 在 Devart.Data.MySql.bj.a()
> 在 Devart.Data.MySql.bj.i()
> 在 Devart.Data.MySql.ae.a(aa[]& A_0, Int32& A_1, Boolean A_2)
> 在 Devart.Data.MySql.ae.a(Byte[] A_0, Int32 A_1, Boolean A_2, String A_3)
> 在 Devart.Data.MySql.g.e()
> 在 Devart.Data.MySql.g.m()
> 在 Devart.Data.MySql.MySqlCommand.InternalExecute(CommandBehavior behavior, IDisposable stmt, Int32 startRecord, Int32 maxRecords)
> 在 Devart.Common.DbCommandBase.InternalExecute(CommandBehavior behavior, IDisposable stmt, Int32 startRecord, Int32 maxRecords, Boolean nonQuery)
> 在 Devart.Common.DbCommandBase.ExecuteDbDataReader(CommandBehavior behavior, Boolean nonQuery)
> 在 Devart.Common.DbCommandBase.ExecuteDbDataReader(CommandBehavior behavior)
> 在 System.Data.Common.DbCommand.ExecuteReader()
> 在 Devart.Common.DbCommandBase.ExecuteNonQuery()
> 在 Devart.Data.MySql.MySqlTransaction..ctor(MySqlConnection A_0, IsolationLevel A_1)
> 在 Devart.Data.MySql.MySqlInternalConnection.BeginTransaction(IsolationLevel il)
> 在 Devart.Common.DbConnectionBase.BeginDbTransaction(IsolationLevel isolationLevel)
> 在 Devart.Data.MySql.MySqlConnection.BeginDbTransaction(IsolationLevel isolationLevel)
> 在 System.Data.Common.DbConnection.BeginTransaction(IsolationLevel isolationLevel)
> 在 System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.<BeginTransaction>b__0(DbConnection t, BeginTransactionInterceptionContext c)
> 在 System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
> 在 System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.BeginTransaction(DbConnection connection, BeginTransactionInterceptionContext interceptionContext)
> 在 System.Data.Entity.Core.EntityClient.EntityConnection.<>c__DisplayClassf.<BeginDbTransaction>b__d()
> 在 System.Data.Entity.Infrastructure.DefaultExecutionStrategy.Execute[TResult](Func`1 operation)
> 在 System.Data.Entity.Core.EntityClient.EntityConnection.BeginDbTransaction(IsolationLevel isolationLevel)

Please, somebody help me, thanks!

[Shalex]

1. Please upgrade to the newest (8.4.602) build of dotConnect for MySQL: https://www.devart.com/dotconnect/mysql ... story.html. Does the issue persist with v8.4.602 as well?
2. We cannot identify the reason of the error at the moment. Try to localize the problem and send us a small test project with the corresponding DDL/DML script for reproducing.
3. Specify the full (x.x.xx) version of your MySQL Server.