asp.net – SelectedDate不适用于Calendar对象

protected void Page_Load(object sender, EventArgs e)
{

    if (Page.IsPostBack)
    {
        cld_birth.SelectedDate = new DateTime(2003, 1, 1);
    }
}

if (Page.IsPostBack)
{
    cld_birth.SelectedDate = new DateTime(2003, 1, 1);
    cld_birth.VisibleDate = new DateTime(2003, 1, 1);
}