Business Day C#

BusinessDay.cs

public static class DateExtensions
{
    public static int BusinessDay(this DateTime data)
    {
        var inicioMes = new DateTime(data.Year, data.Month, 1);

        int total = 0;

        while (inicioMes.Date <= data.Date)
        {
            if (inicioMes.DayOfWeek != DayOfWeek.Friday && inicioMes.DayOfWeek != DayOfWeek.Sunday)
                total++;

            inicioMes = inicioMes.AddDays(1);
        }


        return total;
    }
}