Work with a CALENDAR in WPF

Hello,

I need to use a calendar and I can not set the following functions (in Cobol code):
- BlackoutDates = I used the command "invoke CalSaida::BlackoutDates::Add (new CalendarDateRange (new DateTime (01/01/2016), new DateTime (04/28/2016)))"
but gives nothing
What I want is to block the calendar as of yesterday.

- Selectdates (SelectionMode = "SingleRange") = I used the command "set wrk-reser to CalEntrada::SelectedDates" where wrk-reser is a "SelectedDatesCollection".
The variable-wrk reser has the start date and end date but I can not get.

I ask again for your help.

Thanks