根据某年某月某日,得到对于的星期几

/// <summary>返回当前日期的星期名称</summary>
  /// <param name="dt">日期</param>
  /// <returns>星期名称</returns>
  public static string GetWeekNameOfDay(DateTime idt)
  {
   string dt ,week="";

   dt = idt.DayOfWeek.ToString();
   switch  (dt)
   {
    case "Mondy":
     week= "星期一";
     break;
    case "Tuesday" :
     week= "星期二";
     break;
    case "Wednesday":
     week= "星期三";
     break;
    case "Thursday" :
     week= "星期四";
     break;
    case "Friday" :
     week= "星期五";
     break;
    case "Saturday":
     week= "星期六";
     break;
    case "Sunday":
     week = "星期日";
     break;

   }
   return week;
  }