protected void Page_Load(object sender, EventArgs e)
 {
     if (!Page.IsPostBack)
     {
         TimeOfDay.DataSource = getTimesInRange(new DateTime(2019, 1, 1, 7, 0, 0), new DateTime(2019, 1, 1, 20, 0, 0));
         TimeOfDay.DataBind();
     }
 }