Hi Dmytro, Thanks for contacting us.
Query :How can I implement cascading from Dropdownlist to AutoCompelete, so that It would limit the suggested values in Autocomplete?
By Defualt, there is no option for cascading the data from the DropDownList to the AutoComplete control. But, it can be achieved by using the value property of the Dropdown list as the parent Id in the data source of the auto complete control. We have done a sample based on the scenario that you had mentioned.
Please refer to the below link:
https://www.syncfusion.com/downloads/support/forum/121367/ze/Cascade1554853343
If you have any other query, please let us know.
Regards,
Kalai Selvi M.R