C# Tutorial

HelloWorld.cs

using System;

struct Person
{
    private string _name;
    private int _age;
    public static int st;

    public void SetValues(string name, int age)
    {
        _name = name;
        _age = age;
    }

    public void PrintValues()
    {
        Console.WriteLine($"Name : {_name}, Age : {_age}");
    }
}

enum Days
{
    Sun,
    Mon,
    Tue,
    Wed,
    Thu,
    Fri,
    Sat
};

namespace HelloWorld
{

    class Rectangle
    {
        private double _length;
        private double _width;
        private static int _st;

        public Rectangle()
        {
            Console.WriteLine("The object is being created");
        }

        public Rectangle(int a)
        {
            Console.WriteLine($"The object is being created with a default value : {a}");
        }

        ~Rectangle()
        {
            _length = 0.0;
            _width = 0.0;
            Console.WriteLine("Destructor is running");
        }

        public void StaticIncrementer()
        {
            _st++;
        }

        public void PrintStaticVar()
        {
            Console.WriteLine($"St : {_st}");
        }
        public void SetLength()
        {
            Console.Write("Enter Length : ");
            _length = Convert.ToDouble(Console.ReadLine());
        }

        public void SetWidth()
        {
            Console.Write("Enter Width : ");
            _width = Convert.ToDouble(Console.ReadLine());
        }

        public double GetArea()
        {
            return _length * _width;
        }
    }
    internal class Program
    {
        public static void Main(string[] args)
        {
            var rectangle = new Rectangle();
            var rectangleTwo = new Rectangle(45);
            rectangle.SetLength();
            rectangle.SetWidth();
            var area = rectangle.GetArea();
            Console.WriteLine($"Hello World, the area of the rectangle is {area}");

            var waiting = new DateTime(2021, 10, 10, 17, 58, 1);
            var chat =  $"Message sent at {waiting:t} on {waiting:D}";
            Console.WriteLine(chat);

            var sam = new Person();
            sam.SetValues("Samson", 25);
            sam.PrintValues();
            
            // -- Enums
            var WeekdayStart = (int) Days.Mon;
            var WeekdayEnd = (int) Days.Fri;
            
            Console.WriteLine($"The work week starts at {WeekdayStart} and ends on {WeekdayEnd}");
            // Console.ReadKey();
            
            rectangle.StaticIncrementer();
            rectangleTwo.StaticIncrementer();
            rectangle.PrintStaticVar();
            rectangleTwo.PrintStaticVar();
        }
    }
}

Namespaces.sc

using System;
using firstStep;

namespace firstStep
{
    class FirstStep
    {
        public void func()
        {
           Console.WriteLine("SPace One");
        }
    }
}

namespace HelloWorld
{

    class Person
    {
        private string _name;
        private int _age;

        public Person(string n, int a)
        {
            _name = n;
            _age = a;
        }

        public void Print()
        {
            Console.WriteLine($"Your name is {_name} and you are {_age} years old");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World there!");
            FirstStep fs = new FirstStep();
            fs.func();
            var person = new Person("Samson", 34);
            person.Print();
            
        }
    }
}

Shape.cs

using System;

namespace Shape
{

    class Shape
    {
        protected int Width;
        protected int Height;

        public Shape()
        {
            Console.WriteLine("Initialize Shape");
        }
        ~Shape()
        {
            Console.WriteLine("Destruct Shape");
        }
        public void SetWidth(int w)
        {
            Width = w;
        }

        public void SetHeight(int h)
        {
            Height = h;
        }
    }

    class Rectangle : Shape
    {
        public Rectangle()
        {
            Console.WriteLine("Initialize Rectangle");
        }

        ~Rectangle()
        {
            Console.WriteLine("Destruct Rectangle");
        }
        public int GetArea()
        {
            return Width * Height;
        }
    }
    internal class Program
    {
        public static void Main(string[] args)
        {
            var rectangle = new Rectangle();
            rectangle.SetWidth(34);
            rectangle.SetHeight(45);
            Console.WriteLine($"The rectangle's area is {rectangle.GetArea()}");
        }
    }
}