You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You create a page that contains the following control.   You write the following code segment in the code-behind file for the page.  Private Sub LoadDate（ByVal sender As Object， _ByVal e As EventArgs）  If IsPostBack Then  calBegin.SelectedDate = _  DirectCast（ViewState（"date"）， DateTime） End If  End Sub  Private Sub SaveDate（ByVal sender As Object， _ByVal e As EventArgs）  ViewState（"date"） = calBegin.SelectedDate  End Sub  You need to ensure that the calBegin Calendar control maintains the selected date. Which code segment should you insert in the constructor of the page？ （）

• A、A
• B、B
• C、C
• D、D