RequiredValidator under RadzenDataList not working as expected

Hello Radzen Team,

I am using Radzen 2.17.11 and using the required validator with Text="Required" for DropDown and TextArea under DataList, when I change the one dropdown value the other shows the Required text. Same behavior for the TextArea.
I just want, when the user clicks on the submit button then only it will show the required text for not selected items.
Please share your views on this. Is this case is possible?

Shloke Ghenghat