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. void LoadDate（object sender， EventArgs e） { if （IsPostBack） { calBegin.SelectedDate = （DateTime）ViewState["date"]； } } void SaveDate（object sender， EventArgs e） { ViewState["date"] = calBegin.SelectedDate； } 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？（）
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