Radcalendar having different weekend like (friday,saturday)

Problem: How can we make different weekends like Friday and Saturday in RadCalender ?
Solution: There are two ways,
1) You can do in source of Page like

<telerik:RadCalendar ID="RadCalendar1" Runat="server" FirstDayOfWeek="Thursday">
</telerik:RadCalendar>

Here you can see that Thursday became the first day of week.