BTDBTest.KeyValueDBTest.OnlyOneWrittingTransactionPossible C# (CSharp) Method

        public void OnlyOneWrittingTransactionPossible()
        {
            using (var fileCollection = new InMemoryFileCollection())
            using (IKeyValueDB db = new KeyValueDB(fileCollection))
            {
                using (var tr1 = db.StartTransaction())
                {
                    tr1.CreateKey(_key1);
                    using (var tr2 = db.StartTransaction())
                    {
                        Assert.False(tr2.FindExactKey(_key1));
                        Assert.Throws<BTDBTransactionRetryException>(() => tr2.CreateKey(Key2));
                    }
                }
            }
        }