// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002264/datetime-isweekday

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        DateTime date1 = DateTime.Today;

        DateTime date2 = DateTime.Today.AddDays(2);

        DateTime date3 = DateTime.Today.AddDays(4);

        DateTime date4 = DateTime.Today.AddDays(6);

        Display(date1);

        Display(date2);

        Display(date3);

        Display(date4);

    }

    public static void Display(DateTime date)

    {

        // C# Extension Method: DateTime - IsWeekDay

        if(date.IsWeekDay())

        {

            Console.WriteLine("{0, 40}: It's a week day.", date.ToFullDateTimeString());

        }

        else

        {

            Console.WriteLine("{0, 40}: It's a weekend.", date.ToFullDateTimeString());

        }

    }

}