Hi Srinivasan,
Thanks for your interest in Syncfusion Products.
Please refer the sample illustrates the implementation of the drag-and-drop feature of the TreeViewAdv control where you can restrict dragging for some values in the tree.
Sample link:
http://www.syncfusion.com/uploads/redirect.aspx?file=CS_3e243387.zip&team=developmentLet us know if you have any further concerns.
Regards,
Arulraj.A