// GET: api/TaskManager/5
        public IEnumerable <ParentTask> GetAllParentTasks()
        {
            ProjectManagerBL  taskManagerBL = new ProjectManagerBL();
            List <ParentTask> lstTask       = new List <ParentTask>();

            foreach (var task in taskManagerBL.ReadAllParentTask())
            {
                lstTask.Add(new ParentTask()
                {
                    ParentId       = task.Parent_ID,
                    ParentTaskName = task.Parent_Task
                });
            }
            return(lstTask);
        }