Need code or suggestion on how to do the following.
Create a calendar that will only activate all dates in a particular dataset and highlight only those dates on the calendar
all other dates are disabled
You can check the rendered date (e.Day.Date) is is your DataSource and style it as you wish. Similarly, if the date isn't in your DataSource you can disable it (e.Day.IsDisabled = true)
You should look at the RadCalendarDay docs for details of other properties you can play with.