/// <summary>
 /// Get an id of an Html-element to show a "day-off"
 /// </summary>
 /// <param name="html">Represents support for rendering HTML controls in a strongly typed view</param>
 /// <returns>Id of an Html-element</returns>
 public static IHtmlString GetClosedId(this HtmlHelper <DayOfTheWeek> html)
 {
     return(WeeklyScheduleHtmlHelper.GetWorkingTimeId(html, WorkingTime.Closed));
 }
 /// <summary>
 /// Get an id of an Html-element to show the "round the clock"
 /// </summary>
 /// <param name="html">Represents support for rendering HTML controls in a strongly typed view</param>
 /// <returns>Id of an Html-element</returns>
 public static IHtmlString GetRoundTheClockId(this HtmlHelper <DayOfTheWeek> html)
 {
     return(WeeklyScheduleHtmlHelper.GetWorkingTimeId(html, WorkingTime.RoundTheClock));
 }