DragItemMode: None OnlyMe OnlyChangeRows AllItems Children ChildrenIncrementOrder ResizeItemBeginMode: None OnlyMe WithNeighbour IncrementOrder MoveNeighbours ResizeItemEndMode: None OnlyMe WithNeighbour IncrementOrder MoveNeighbours Allows: change level item dragging outside overlap items   do not change time (javascript condition) Mouse position information: ???

SchedulerItem objects on a main grid can be moved with a mouse. Dragging a left or right edge of a rectangle, you can change duration of a SchedulerItem. These operations result in changing start and end times and a ResourceRow objects a given SchedulerItem is assigned to. A way this function works is determined by a Scheduler.BehaviourOptions property. This is a property containing bit values (flags) representing deifferent settings.
Turning a SchedulerBehaviorOptions.AllowChangeLevelItem flag off causes moving a SchedulerItem object to a different level in a ResourceRow objects tree impossible. E.i. a parent ResourceRow object a SchedulerItem is assigned to cannot change. It can only be moved to neighbour resource objects on the same level of a tree.
Other setting of SchedulerBehaviorOptions.AllowDraggingOutside means that it is possible to move SchedulerItem objects in such a way that a start or end time will be outside a period of time currently visible on a control.
Switching a SchedulerBehaviorOptions.AllowOverlapItems flag off disallows a SchedulerItem object to overlap other object. It means that two SchedulerItem objects in the same resource cannot overlap.
A control enables linking SchedulerItem objects. An item object can then point to next item objects. A relation is visualised by an arrow. drag &drop operations affect linked objects also in a way determined by a Scheduler object properties. A Scheduler.DragItemMode property determines how linked objects are to be modified when an object is moved. It is possible to move only an object being changed (other are not moved) or other objects can be moved simultaneously (only when a resource is not changed). There is also a setting moving all child objects and not moving parent objects. There is also a setting disallowing moving an object before the end of previous objects.
ResizeItemBeginMode property determines a way previous objects are to be changed when only a start time is changed and a ResizeItemEndMode property a way subsequent objects are to be changed after an end date is changed. Settings allow to move linked objects as a whole without changing duration or moving neighboring objects appropriately. It is also possilbe to disallow changing linked objects.
This page demonstrates all these settings. Changing fields on the right you can cause a postback to be executed and OnLoad server method to modify properties of a Scheduler object accordingly. It makes it easy to check operation of a control with different settings.

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If you would look into a source code for this demo, click on the link.
For demonstration purposes all appointments displayed on a calendar are stored in ASP.NET session objects, so original values are restored immediately after a new session object is created.
A list of appointments and resources is intialized every time a new session is started.