GanttView allows you to define the deadline of a task, which indicates the time by which a task must be completed. To specify the task deadline, you can use the Deadline property of the Task class.

終了日時が期限の日を超えると、次の図のようにタスク番号の横に赤いインジケータが表示されます。

Below code snippet shows how you can set the deadline of a task in GanttView.

//タスクの期限を設定します。
Task1.Deadline = new DateTime(2021, 06, 7);