I have used RadDatePicker in my C# project ..... i am showing the date of the  booked appointment with specific color. Now the problem is that this RadDatePicker is loaded in the Page Load event which causes a long time to load the page [due to DayRenderEvent].......... i want to Load the Calender on its  DatePopupButton-Image .... Please give me a proper solution for this..... thank you.

Hello priya,

The load-on-demand functionality for RadCalendar (when part of RadDatePicker) you request is not supported. The only option for performance optimization I can offer you is to implement a shared calendar in case you have multiple date picker instances on the page.

Best regards,
Sebastian
the Telerik team