/// <summary>
        /// Delete a Material
        /// </summary>
        /// <param name="id">material id</param>
        /// <returns></returns>
        public IResult DeleteMaterial(string id)
        {
            var result = new Result
            {
                Operation = Operation.Delete,
                Status    = Status.Success
            };

            try
            {
                _materialRepository.DeleteOne(t => t.MaterialId == ObjectId.Parse(id));
                result.Message = MaterialNotification.Deleted;
            }
            catch (Exception e)
            {
                result.Message = e.Message;
                result.Status  = Status.Fail;
            }
            return(result);
        }