Telerik UI DatePicker in RazorPages
RazorPage is an alternative to the MVC pattern that makes page-focused coding easier and more productive. It consists of a cshtml file and a cs file (generally the two files have the same name). The Telerik UI DatePicker for ASP.NET Core can be integrated in such an application seamlessly.
For a runnable example, you can refer to the following DateTimePicker sample, which in this case applies for the DatePicker widget as well in the same fashion:
DateTimePicker in RazorPages example