Constructors,Members Object,object initializer

Demo on Constructors

using System;
namespace FreshersLike.Constructors
{
    class Test
    {
        public int ns;             //Non-Static variable
        public static int s;    //Static variable

        static Test()          //Static Constructor
        {
            s = 100;

            //ns = 100; Error : Static constructors cant initialize Non-Static variables
        }

        public Test()       //Non-Static Constructor
        {
            ns = 1000;
            s = 1000;
        }
    }

    class ConstructorsDemo
    {
        public static void Main()
        {
            Console.WriteLine("Value of S before object creation : {0} ", Test.s);

            Test t = new Test();

            Console.WriteLine("Values of NS and S : {0} , {1} " , t.ns , Test.s );
        }
    }
}

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Demo on Class , Members and Object

using System;

namespace FreshersLike
{
    class Test
    {
        public int ns;            //Non-Static Member
        public static int s;    //Static Member
    }

    class MembersDemo
    {
        public static  void Main()
        {

            Test t1 = new Test();
            Test t2;

            t2 = new Test();
            t1.ns = 100;

            t2.ns = 1000;
            // t1.s = 500; Error

            Test.s = 500;
            Console.WriteLine("{0} , {1} , {2} ", t1.ns , t2.ns , Test.s);
        }
    }
}

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Demo on Object initializer  of C# 3.0

using System;
namespace FreshersLike
{
    class Department
    {
        public int Deptno;

        public string Dname, Loc;

        public static int TotalDepartments;

        static Department()
        {
            TotalDepartments = 0;
        }

        public Department()
        {
            TotalDepartments += 1;
        }
    }

    class ObjectIntializerDemo
    {
        public static void Main()
        {
            Department d1 = new Department()
            {
                Deptno = 10,
                Dname = "SALES",
                Loc = "HYD"
            };

            Department d2 = new Department()
            {
                Deptno = 20,
                Loc = "Bang"
            };

            Department d3 = new Department() { Deptno = 30 };

            Console.WriteLine("Total Departments : {0} " , Department.TotalDepartments );

            Console.WriteLine("Department # : {0} \nDepartment Name : {1} \nLocation : {2} ", d1.Deptno , d1.Dname , d1.Loc );

            Console.WriteLine("Department # : {0} \nDepartment Name : {1} \nLocation : {2} ", d2.Deptno, d2.Dname, d2.Loc);

            Console.WriteLine("Department # : {0} \nDepartment Name : {1} \nLocation : {2} ", d3.Deptno, d3.Dname, d3.Loc);

        }
    }
}

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Demo on Optional Parameter & Named Parameter Passing.

using System;

namespace FreshersLike
{
    class Employee
    {
        private int Empno;

        private string Ename , Job;

        private decimal Salary, Commission;

        public void SetEmployee(int eno, string ename, decimal comm = 0, decimal salary = 10000, string job = "SALESMAN")
        {
            Empno = eno;

            Ename = ename;

            Job = job;
            Salary = salary;
            Commission = comm;
        }

        public void ShowEmployee()
        {
            Console.WriteLine("Employee # : {0} \nEmployee Name : {1} \nSalary : Rs. {2} \nCommission : Rs. {3} \nJob : {4} ", Empno , Ename , Salary , Commission , Job );
        }
    }

    class OptionalParameterDemo
    {
        public static void Main()
        {
            Employee emp = new Employee();

            //emp.SetEmployee(101, "Ramesh", salary: 50000, job: "Manager");

            emp.SetEmployee(101, "Kumar", 1000);

            emp.ShowEmployee();

        }
    }
}