public async Task<IHttpActionResult> PostBranch(Branch branch)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Branch.Add(branch);

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateException)
            {
                if (BranchExists(branch.BranchId))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = branch.BranchId }, branch);
        }
        // PUT api/Branch/5
        public async Task<IHttpActionResult> PutBranch(int id, Branch branch)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != branch.BranchId)
            {
                return BadRequest();
            }

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

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!BranchExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }