How do you assign a datepicker from a textbox?

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I would like to have the user input a date in one datepicker, then underneath input the number of weeks between the two dates. The second datepicker will then assign that date weeks, days or years later.

What I have tried:

I have the two datepickers and the textbox:
<datepicker x:name="Date1"
="" focusable="False" displaydate="01/01/2022" displaydatestart="01/01/2022" displaydateend="12/31/2022" istodayhighlighted="True">

<textbox x:name="Text 1"
="" tooltip="Enter the number of weeks between dates" background="AliceBlue" borderbrush="Black" borderthickness="2" textalignment="Center" horizontalalignment="Stretch">

<datepicker x:name="Date2"
="" focusable="False" displaydate="01/01/2022" displaydatestart="01/01/2022" displaydateend="12/31/2022">

Posted 19-Oct-22 1:19am

Member 15802897

Updated 19-Oct-22 6:11am

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Comments

Richard Deeming 19-Oct-22 7:30am

Take the number of weeks, multiply by 7, and pass that to the DateTime's AddDays method. What's the problem?

Member 15802897 19-Oct-22 9:41am

How would you do that? I tried this way (if (int.TryParse(Text1.Text, out int weeksToAdd) && Date1.SelectedDate.HasValue)
Date2.SelectedDate = Date1.SelectedDate.Value.AddDays(7 * weeksToAdd);) but I'm still getting an error.

Richard Deeming 19-Oct-22 9:52am

What error?

Ralf Meier 19-Oct-22 10:48am

Show the complete code from this ... and tell when it is called ...

Member 15802897 19-Oct-22 10:40am

It says that the nullable type might be null
And that datepicker does not contain a Add days feature

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CHill60 · Answer 1 · 2022-10-19T06:11:00

Richard did not suggest using Add on the Datepicker.
As this is an assignment I will not give you the code, but here are the steps to follow and some reference material you may find useful

1. Create a DateTime variable
2. Assign the Date value from the first DatePicker to that variable
3. Extract the number of weeks from the TextBox - you might find Int32.TryParse Method (System)/a>[^] useful
4. Multiply the number of weeks by 7 to get the number of days to add
5. Use the datetime.adddays[^] to add the results from step 4 to the variable you populated in step 2
6. Assign the value of the results of step 5 to the second datepicker