public bool Update(int idTask, TaskModel modifiedModel)
        {
            var model = (TaskModel)GetById(idTask);

            try
            {
                if (repo.Update(model, modifiedModel))
                {
                    var originalTaskIndex = TasksSingleton.Instance.Tasks.IndexOf(TasksSingleton.Instance.Tasks.Where(t => t.IdTask == idTask).FirstOrDefault());
                    TasksSingleton.Instance.Tasks[originalTaskIndex] = modifiedModel;
                }

                return(true);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }