diff --git a/tests/BusiGrpcService/Services/BusiApiService.cs b/tests/BusiGrpcService/Services/BusiApiService.cs
index df9e1a2..34d2f1e 100644
--- a/tests/BusiGrpcService/Services/BusiApiService.cs
+++ b/tests/BusiGrpcService/Services/BusiApiService.cs
@@ -5,6 +5,7 @@
 using System.Text.Json;
 using Dapper;
 using System.Data.Common;
+using DtmCommon;
 using DtmSERedisBarrier;
 
 namespace BusiGrpcService.Services
@@ -140,6 +141,18 @@ public override async Task<BusiReply> QueryPrepared(BusiReq request, ServerCallC
             throw Dtmgrpc.DtmGImp.Utils.DtmError2GrpcError(ex);
         }
 
+        // real mysql query prepared demo, just copy it!
+        public override async Task<Empty> QueryPreparedMySqlReal(BusiReq request, ServerCallContext context)
+        {
+            BranchBarrier barrier = _barrierFactory.CreateBranchBarrier(context);
+            string result = await barrier.QueryPrepared(this.GetBarrierConn());
+
+            Exception ex = Dtmgrpc.DtmGImp.Utils.String2DtmError(result);
+            if (ex != null)
+                throw Dtmgrpc.DtmGImp.Utils.DtmError2GrpcError(ex);
+            return new Empty();
+        }
+
         public override async Task<Empty> TransInRedis(BusiReq request, ServerCallContext context)
         {
             _logger.LogInformation("TransInRedis req={req}", JsonSerializer.Serialize(request));
diff --git a/tests/Dtmgrpc.IntegrationTests/Dtmgrpc.IntegrationTests.csproj b/tests/Dtmgrpc.IntegrationTests/Dtmgrpc.IntegrationTests.csproj
index 42a896c..7774af3 100644
--- a/tests/Dtmgrpc.IntegrationTests/Dtmgrpc.IntegrationTests.csproj
+++ b/tests/Dtmgrpc.IntegrationTests/Dtmgrpc.IntegrationTests.csproj
@@ -19,6 +19,7 @@
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
 			<PrivateAssets>all</PrivateAssets>
 		</PackageReference>
+		<PackageReference Include="MySqlConnector" Version="$(MySqlConnectorPackageVersion)" />
 	</ItemGroup>
 
 	<ItemGroup>
diff --git a/tests/Dtmgrpc.IntegrationTests/MsgGrpcTest.cs b/tests/Dtmgrpc.IntegrationTests/MsgGrpcTest.cs
index fa6a10d..d19ae00 100644
--- a/tests/Dtmgrpc.IntegrationTests/MsgGrpcTest.cs
+++ b/tests/Dtmgrpc.IntegrationTests/MsgGrpcTest.cs
@@ -1,6 +1,11 @@
 using Microsoft.Extensions.DependencyInjection;
 using System;
+using System.Data.Common;
 using System.Threading.Tasks;
+using System.Transactions;
+using Dapper;
+using Grpc.Core;
+using MySqlConnector;
 using Xunit;
 
 namespace Dtmgrpc.IntegrationTests
@@ -27,5 +32,100 @@ public async Task Submit_Should_Succeed()
             var status = await ITTestHelper.GetTranStatus(gid);
             Assert.Equal("succeed", status);
         }
+
+        [Fact]
+        public async Task DoAndSubmit_Should_DbTrans_Exception()
+        {
+            var provider = ITTestHelper.AddDtmGrpc();
+            var transFactory = provider.GetRequiredService<IDtmTransFactory>();
+
+            var gid = "msgTestGid" + Guid.NewGuid().ToString();
+            var msg = transFactory.NewMsgGrpc(gid);
+            var req = ITTestHelper.GenBusiReq(false, false);
+            var busiGrpc = ITTestHelper.BuisgRPCUrl;
+
+            msg.Add(busiGrpc + "/busi.Busi/TransIn", req);
+            // do TransOut local, then TransIn with DTM.
+            await Assert.ThrowsAsync<System.InvalidOperationException>(async () =>
+            {
+                // System.InvalidOperationException: A TransactionScope must be disposed on the same thread that it was created.
+                // 
+                // System.InvalidOperationException
+                // A TransactionScope must be disposed on the same thread that it was created.
+                //    at Dtmgrpc.MsgGrpc.DoAndSubmit(String queryPrepared, Func`2 busiCall, CancellationToken cancellationToken) in /home/yunjin/Data/projects/github/dtm-labs/client-csharp/src/Dtmgrpc/Msg/MsgGrpc.cs:line 110
+
+                await msg.DoAndSubmit(busiGrpc + "/busi.Busi/QueryPreparedMySqlReal", async branchBarrier =>
+                {
+                    MySqlConnection conn = getBarrierMySqlConnection();
+                    await branchBarrier.Call(conn, () =>
+                        {
+                            Task task = this.LocalAdjustBalance(conn, TransOutUID, -req.Amount, "SUCCESS");
+                            return task;
+                        },
+                        TransactionScopeOption.Required,
+                        IsolationLevel.ReadCommitted
+                        // , default TransactionScopeAsyncFlowOption.Suppress 
+                    );
+                });
+            });
+
+            await Task.Delay(4000);
+            var status = await ITTestHelper.GetTranStatus(gid);
+            // The exception did not affect the local transaction commit
+            Assert.Equal("succeed", status);
+        }
+
+        [Fact]
+        public async Task DoAndSubmit_Should_Succeed()
+        {
+            var provider = ITTestHelper.AddDtmGrpc();
+            var transFactory = provider.GetRequiredService<IDtmTransFactory>();
+
+            var gid = "msgTestGid" + Guid.NewGuid().ToString();
+            var msg = transFactory.NewMsgGrpc(gid);
+            var req = ITTestHelper.GenBusiReq(false, false);
+            var busiGrpc = ITTestHelper.BuisgRPCUrl;
+
+            msg.Add(busiGrpc + "/busi.Busi/TransIn", req);
+            // do TransOut local, then TransIn with DTM.
+
+            await msg.DoAndSubmit(busiGrpc + "/busi.Busi/QueryPreparedMySqlReal", async branchBarrier =>
+            {
+                MySqlConnection conn = getBarrierMySqlConnection();
+                await branchBarrier.Call(conn, () =>
+                    {
+                        Task task = this.LocalAdjustBalance(conn, TransOutUID, -req.Amount, "SUCCESS");
+                        return task;
+                    },
+                    TransactionScopeOption.Required,
+                    IsolationLevel.ReadCommitted,
+                    TransactionScopeAsyncFlowOption.Enabled);
+            });
+
+            await Task.Delay(2000);
+            var status = await ITTestHelper.GetTranStatus(gid);
+            Assert.Equal("succeed", status);
+        }
+
+        private static readonly int TransOutUID = 1;
+
+        private static readonly int TransInUID = 2;
+
+        private MySqlConnection getBarrierMySqlConnection() => new("Server=localhost;port=3306;User ID=root;Password=123456;Database=dtm_barrier");
+
+        private async Task LocalAdjustBalance(DbConnection conn, int uid, long amount, string result)
+        {
+            // _logger.LogInformation("AdjustBalanceLocal uid={uid}, amount={amount}, result={result}", uid, amount, result);
+
+            if (result.Equals("FAILURE"))
+            {
+                throw new RpcException(new Status(StatusCode.Aborted, "FAILURE"));
+            }
+
+            await conn.ExecuteAsync(
+                sql: "update dtm_busi.user_account set balance = balance + @balance where user_id = @user_id",
+                param: new { balance = amount, user_id = uid }
+            );
+        }
     }
 }
diff --git a/tests/protos/busi.proto b/tests/protos/busi.proto
index 86932ea..932ef1e 100644
--- a/tests/protos/busi.proto
+++ b/tests/protos/busi.proto
@@ -45,6 +45,6 @@ service Busi {
   rpc TransOutRevertRedis(BusiReq) returns (google.protobuf.Empty) {}
 
   rpc QueryPrepared(BusiReq) returns (BusiReply) {}
-  rpc QueryPreparedB(BusiReq) returns (google.protobuf.Empty) {}
+  rpc QueryPreparedMySqlReal(BusiReq) returns (google.protobuf.Empty) {}
   rpc QueryPreparedRedis(BusiReq) returns (google.protobuf.Empty) {}
 }
\ No newline at end of file