Static vs Instance

Static properties or function or methods are shared by all instances of their class, they don't get created or instantiated they're just always there.

class Person

{

    static int _runningID = 0;

    public int Id { get; } = _runningID++;

    public string Name { get; set; }

    public void SayHi() {

        Console.WriteLine($"Hi my name is {Name}");

    }

    static Type GetMyType()

    {

        return typeof(Person);

    }

}

in the above class we see that if we have to instances of person they'll share their static members but have instances of their own non static members.

    class Program

    {

        static void Main(string[] args)

        {

            var p1 = new Person { Name = "Pawel" };

            var p2 = new Person { Name = "Ian" };

            p1.SayHi();

            p2.SayHi();

            Console.WriteLine(Person.GetMyType());

        }

    }

and you can see from the above we call instance and static members, instance members have to be called from the instantiated instance of a class whereas Static ones must be called from the class definition.