How do I set a nullable DateTime to null in VB.NET?

Question

I am trying to set up a date range filter on my UI, with checkboxes to say whether a DateTimePicker\'s value should be used, e.g.

Dim fromDate As DateTime? =         


        

Answer 1

Use New Date as a magic number:

Dim fromDate As New Date
If fromDatePicker.Checked Then
  fromDate = fromDatePicker.Value
End If
If fromDate <> New Date Then
  list = list.Where(Function(i) i.InvDate.Value >= fromDate.Value)
End If