public void AddTaskToComplete(string description)
        {
            if (this.TaskToCompleteList != null)
            {
                TaskToCompleteViewModel taskToComplete = new TaskToCompleteViewModel(description);

                TaskToCompleteList.Add(taskToComplete);
            }
        }
        public void AddTaskToComplete()
        {
            if (this.TaskToCompleteList != null && !string.IsNullOrWhiteSpace(this.newTaskDescription))
            {
                TaskToCompleteViewModel taskToComplete = new TaskToCompleteViewModel(this.newTaskDescription);

                TaskToCompleteList.Add(taskToComplete);

                this.NewTaskDescription = Constants.DefaultTaskDescription;
            }
        }