using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var date = new DateTime(2021,3,27);

        Console.WriteLine( date.AddDaysUntilWeekday() );

    }

}

​

public static class DateTimeExtensions

{

    public static DateTime AddDaysUntilWeekday(this DateTime t)

    {

        return (new List<int> {0,6}).Contains( (int)t.DayOfWeek) ? t.AddDays(1).AddDaysUntilWeekday() : t;

    }

​

}