update samples

samples/Sample.Kafka.MySql/Controllers/ValuesController.cs

 using System;
 using System.Data;
 using System.Data.SqlClient;
-using System.Transactions;
 using Dapper;
 using DotNetCore.CAP;
 using Microsoft.AspNetCore.Mvc;
@@ -30,7 +29,6 @@ namespace Sample.Kafka.MySql.Controllers
         [Route("~/adonet/transaction")]
         public IActionResult AdonetWithTransaction()
         {
-            //NOTE: Add `IgnoreCommandTransaction=true;` to your connection string, see https://github.com/mysql-net/MySqlConnector/issues/474
             using (var connection = new SqlConnection(Startup.ConnectionString))
             {
                 using (var transaction = connection.BeginTransaction(_capBus, autoCommit: false))

samples/Sample.RabbitMQ.MySql/AppDbContext.cs

@@ -11,7 +11,7 @@ namespace Sample.RabbitMQ.MySql
 
     public class AppDbContext : DbContext
     {
-        public const string ConnectionString = "Server=192.168.10.110;Database=testcap;UserId=root;Password=123123;IgnoreCommandTransaction=true;";
+        public const string ConnectionString = "Server=192.168.10.110;Database=testcap;UserId=root;Password=123123;";
 
         public DbSet<Person> Persons { get; set; }
 

samples/Sample.RabbitMQ.MySql/Controllers/ValuesController.cs

@@ -28,7 +28,6 @@ namespace Sample.RabbitMQ.MySql.Controllers
         [Route("~/adonet/transaction")]
         public IActionResult AdonetWithTransaction()
         {
-            //NOTE: Add `IgnoreCommandTransaction=true;` to your connection string, see https://github.com/mysql-net/MySqlConnector/issues/474
             using (var connection = new MySqlConnection(AppDbContext.ConnectionString))
             {
                 using (var transaction = connection.BeginTransaction(_capBus, autoCommit: false))