How to set Date variable to null in VB.NET

Question

I want to assign the DOB variable as null.

Dim DOB As Date = DTPSdob.Value
Dim datestring As String = DOB.ToString("d")
If chkSdob.Checked = False Then
      DOB = 'I want to assign here DOB variable as null'
Else
      DOB = datestring
End If

Answer 1

Use nullable datetime

    Dim DOB As Nullable(Of Date) = Date.Now
    Dim datestring As String = DOB.Value.ToString("d")
    DOB = Nothing

Answer 2

“DateTime is a value type (a structure) and can not be set to null or nothing as with all .Net value types. The default value for a datetime value is zeros for the date portion and 12:00:00 AM for the Time portion.”

VB.NET - Nullable DateTime and Ternary Operator