C# wpf calendar choose dates

I am trying to implement a basic project in C# wpf . I would like to choose dates from a calendar and these dates to appear on the screen.
i use the component calendar from toolkit with the code :

 private void monthCalendar1_DateChanged(object sender, DateRangeEventArgs e)
        {
        }
 

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i did a google search and i find that with the code something like

 private void Calendar_SelectedDatesChanged(object sender,
            SelectionChangedEventArgs e)
        {
            // ... Get reference.
            var calendar = sender as Calendar;

            // ... See if a date is selected.
            if (calendar.SelectedDate.HasValue)
            {
                // ... Display SelectedDate in Title.
                DateTime date = calendar.SelectedDate.Value;
                this.Title = date.ToShortDateString();
            }

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the problem is that if i use calendar.Selected then an error appear .

How to solve this? Also can i find good reference for beginner in C#?
GasAsked:
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Chinmay PatelChief Technical NinjaCommented:
Hi Gas,

It is always a good practice to provide the exact error details. Also I think there is a typo in your question. calendar.Selected? or calendar.SelectedDate?

And to learn C# I strongly recommend the following 2 books
1. https://www.microsoftpressstore.com/store/exam-ref-70-483-programming-in-c-sharp-9781509306985 - I have used this one personally and though it is bit certification oriented, I loved the author simplifies C# concepts.
2. https://www.microsoftpressstore.com/store/microsoft-visual-c-sharp-step-by-step-9781509307760 - I have not read this one, but have heard good reviews from colleagues/friends.

Regards,
Chinmay.

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