Hello Kal,

Kal said:

1. The user will be free to drag the first task to the left, and the second task will have to be dragged with it and not hang behind, as it does now because of the constraint.

2. When the user removes the dependency, the task will remain in its place and will not jump to a different location as it does now.

The mentioned behavior is by design, but if you want to acheive your requirements, maybe you could try to handle  ultraGanttView1_InitializeTaskGridRow() event and modify your StartDateTime and ConstraintDateTime properties of your dependencies tasks. By this way when you drag your first task, your second task will follow it. Also when you set the StartDateTime, you will be able to remove your dependecy and you second task will keep current position.

private void ultraGanttView1_InitializeTaskGridRow(object sender, Infragistics.Win.UltraWinGanttView.InitializeTaskGridRowEventArgs e)

        {

      if (e.Task == null) return;

           var  tasks = ultraCalendarInfo1.Tasks.Where(p => p.Dependencies.Contains(e.Task));

           foreach (Task task in tasks)

            {

                task.ConstraintDateTime = e.Task.ConstraintDateTime.AddDays(2);

                task.StartDateTime = e.Task.ConstraintDateTime.AddDays(2);

            }

        }

Kal said:

Is there a way to disable/ignore the constraints so it will not cause this unexpected behavior ?

No, at that moment we have not such functionality

Kal said:

If it isn't possible, how do I accomplish all this through code ? Maybe through an event ?

Yes, Maybe one possible approach could be the mentioned solution above.

Please take a look at the attached video file with my suggestion and please feel free to write me if you have anny questions.

Regards