Sumar fechas sin tomar en cuenta fines de semana

Una compañerita de trabajo me pidió un favor el cual consistía en poder sumarle a una fecha N días pero sin tomar en cuenta los fines de semana.Las siguientes funciones hacen dicha tarea:

• DateTimeIgnoringWeekEnds: La cual recibe como parametros la fecha inicial y los días a sumar.
  



• NumberOfWeekEndDays: Esta función es usada por la función anterior y nos ayuda a saber cuantos días son sabado o domingo entre dos fechas.
  

private int NumberOfWeekEndDays(DateTime startDate, DateTime endDate)
{
  int intContador = 0;
  DateTime tempDate = startDate;
  while (tempDate <= endDate)
  {
      if (tempDate.DayOfWeek == DayOfWeek.Saturday ||
tempDate.DayOfWeek == DayOfWeek.Sunday)
      {
          intContador++;
      }
      tempDate = tempDate.AddDays(1);
  }

  return intContador;
}

public DateTime DateTimeIgnoringWeekEnds(DateTime starDate, int days)
{
  int intweekends = 0;
  int intHelp = 0;

  DateTime endDate = starDate.AddDays(days);

  do
  {
      intweekends = NumberOfWeekEndDays(starDate, endDate);
      endDate = starDate.AddDays(days + intweekends);

      if (intHelp == 0 || intHelp != intweekends)
          intHelp = intweekends;
      else
          intweekends = 0;

  } while (intweekends != 0);

  return endDate;
}

    Ejemplo :

  DateTime dtmFechInicio = DateTime.Now;
  DateTime dtmFechaFinal = DateTimeIgnoringWeekEnds(dtmFechInicio, 13);

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