The Calendar Control provides us the multiple selection modes like (MultipleRange, SingleDate, SingleRange).
We can set it according to our requirements. In my example, I use the MultipleRange mode:

12345.png

<Grid>
<my:Calendar Margin="10,10,88,82" Name="calendar1" SelectionMode="MultipleRange" />
</Grid>



After that when we run this program:

123456.png