C# Method Returning an Object

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MethodReturningAnObject
{
    class points
    {
        int x, y;
        public points()//default constructor
        {
            x = y = 0;
        }
        public points(int x,int y)//Parameterized constructor
        {
            this.x = x;
            this.y = y;
        }
        public void print()
        {
            Console.WriteLine(x + " " + y);
        }
        //this method is returning an object
        public points add(points p1,points p2)
        {
            points p3 = new points();
            p3.x = p1.x + p2.x;
            p3.y = p1.y + p2.y;
            return p3;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            points p1 = new points(4,7);
            points p2 = new points(1, 2);

            points p3 = new points();
            p1.print();
            p2.print();
            p3 = p3.add(p1, p2);
            Console.WriteLine("-----------");
            p3.print();


        }
    }
}

C# Static Members

Static members:

================

1) Static variables:
====================
 Only one copy of static variable is created and it can be shared by any number of objects.
 The default initial value for a static variable is zero (0).

2) Static method:
=================
 Static method can only can only access the static variable.
 To access static method, it must be invoked through class name.

Syntax:
-------  class_name.static_method_name();

Example
-------  enroll.count(); 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StaticMembers
{
    class enroll
    {
        public string name, course;
        public static int k;//Static variable
        public enroll(string n,string c)
        {
            name = n;
            course = c;
            k++;
        }
        public static void count()//Static method
        {
            Console.WriteLine("Total number of students: " + k);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            enroll.count();
            enroll e1 = new enroll("Kamran", "BCA");
            enroll e2 = new enroll("Keyvan", "Msc");
            enroll.count();

            Console.WriteLine("--------------------");
            Console.WriteLine("Name \t Course");
            Console.WriteLine(e1.name + "\t" + e1.course);
            Console.WriteLine(e2.name + "\t" + e2.course);
            Console.WriteLine("--------------------");
        }
    }
}