c# interface

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

namespace interfacesdemo
{
    interface payroll //don't put security on it
    {//pre-defines names
        void print_t4();
        double taxit(double x);
    }
    class emp : payroll
    {   public void print_t4()
        {   Console.WriteLine("my code");
        }
        public double taxit(double x)
        {   return x * 0.3;
        }
    }
    class worker:ICloneable,IDisposable 
    {   public string name;
        public double salary;
        public void Copy(worker w)
        {   this.name = w.name; //multi-variable copy
            this.salary = w.salary;
        }
        public object Clone()
        {   return this.MemberwiseClone();//single line copy all variables
        }
        public void Dispose()//like a destructor for memory
        {//remove line of code it makes
        }
    }
    class mylist : IList<worker> //allows you to make your own lists
    {
        public int IndexOf(worker item)
        {
            throw new NotImplementedException();
        }

        public void Insert(int index, worker item)
        {
            throw new NotImplementedException();
        }

        public void RemoveAt(int index)
        {
            throw new NotImplementedException();
        }

        public worker this[int index]
        {
            get
            {
                throw new NotImplementedException();
            }
            set
            {
                throw new NotImplementedException();
            }
        }

        public void Add(worker item)
        {
            throw new NotImplementedException();
        }

        public void Clear()
        {
            throw new NotImplementedException();
        }

        public bool Contains(worker item)
        {
            throw new NotImplementedException();
        }

        public void CopyTo(worker[] array, int arrayIndex)
        {
            throw new NotImplementedException();
        }

        public int Count
        {
            get { throw new NotImplementedException(); }
        }

        public bool IsReadOnly
        {
            get { throw new NotImplementedException(); }
        }

        public bool Remove(worker item)
        {
            throw new NotImplementedException();
        }

        public IEnumerator<worker> GetEnumerator()
        {
            throw new NotImplementedException();
        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
            throw new NotImplementedException();
        }
    }
    class Program
    {   static void Main(string[] args)
        {
        using(worker wx=new worker())
        {
            wx.name="ed";
        }//memory is thrown away immediately
            worker w1 = new worker();
            w1.name = "bob";
            w1.salary = 80000;
            worker w2 = new worker();
            w2 = (worker)w1.Clone();//like a copy
            w2.Copy(w1);
            //memory control
            w1 = null; //eventually remove memory
            {
                worker w3 = new worker();
                w3.name = "ed";
            } //at end of brackets, memory eventually goes away
            System.GC.Collect(); //do this if brackets or null used
        //collect removes memory immediately
            //payroll p = new payroll();  cannot use directly
        }
    }
}