Hi Kuldeep,
You can refer to this help topic where similar functionality is described with the pickers in Change end date/time automatically when start date/time changes section. You can achieve the desired issue by using similar steps and RadCombobox instead of the pickers. in the Clear selection for the user combobox if no room is selected section it is described how to get the resource combo.
Hope this will be helpful.
Regards,
Plamen
the Telerik team
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