static void Main(string[] args)
        {
            DoMultiple();
            var options = new DbContextOptionsBuilder <DBContext1>()
                          .UseSqlServer(new Microsoft.Data.SqlClient.SqlConnection("Data Source=.;Initial Catalog=db1;Integrated Security=True; "))
                          .Options;

            var options2 = new DbContextOptionsBuilder <DBContext2>()
                           .UseSqlServer(new Microsoft.Data.SqlClient.SqlConnection("Data Source=.;Initial Catalog=db2;Integrated Security=True; "))
                           .Options;

            using (var context1 = new DBContext1(options))
            {
                using (var transaction = context1.Database.BeginTransaction())
                {
                    try
                    {
                        context1.Blogs.Add(new Blog {
                            Url = "http://blogs.msdn.com/dotnet"
                        });
                        context1.SaveChanges();

                        using (var context2 = new DBContext2(options2))
                        {
                            context2.Database.UseTransaction(transaction.GetDbTransaction());

                            context2.Add(new Persons()
                            {
                                Name = "m1"
                            });
                        }
                        // Commit transaction if all commands succeed, transaction will auto-rollback
                        // when disposed if either commands fails
                        transaction.Commit();
                    }
                    catch (Exception)
                    {
                        // TODO: Handle failure
                    }
                }
                ////     ///////////////////////////////////////////////
            }
            var optionsBuilder = new DbContextOptionsBuilder <DBContext1>();

            optionsBuilder.UseSqlServer("Data Source=.;Initial Catalog=db1;Integrated Security=True; ");
            using (DBContext1 context1 = new DBContext1(optionsBuilder.Options))
            {
                using (var transaction = context1.Database.BeginTransaction())
                {
                    context1.Add(new Blog {
                        Url = "url tran"
                    });
                    context1.SaveChanges();
                    using (DBContext1 context2 = new DBContext1(optionsBuilder.Options))
                    {
                        DbTransaction tran = transaction.GetDbTransaction();
                        context2.Database.UseTransaction(tran);


                        context1.Add(new Blog {
                            Url = "url tran"
                        });
                        //context2.Add(new Persons() { Name = "m1" });
                    }


                    transaction.Commit();
                }
            }
        }