public IHttpActionResult PostTransaction(TransactionsModel transaction)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            var dbPostTransaction = new Transaction();

            dbPostTransaction.Update(transaction);

            dbPostTransaction.Add(transaction);

            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = dbPostTransaction.TransactionID }, transaction);
        }
        public IHttpActionResult GetTransaction(int id)
        {
            Transaction dbTransaction = db.Transactions.Find(id);

            if (dbTransaction == null)
            {
                return NotFound();
            }
            TransactionsModel modelTransaction = new TransactionsModel
            {
                TransactionID = dbTransaction.TransactionID,
                AccountID = dbTransaction.AccountID,
                TransactionDate = dbTransaction.TransactionDate,
                Amount = dbTransaction.Amount,
            };
            return Ok(dbTransaction);
        }
        public IHttpActionResult PutTransaction(int id, TransactionsModel transaction)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != transaction.TransactionID)
            {
                return BadRequest();
            }
            var dbPutTransaction = db.Transactions.Find(transaction.TransactionID);

            dbPutTransaction.Update(transaction);

            db.Entry(dbPutTransaction).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!TransactionExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }