using System;

public class Program

{

    public class Test1

    {

        public string Name { get; init; }

    }

    public record Member 

    {

        public int ID { get; init; }

        public string FirstName { get; init; }

        public string LastName { get; init; }

        public string Address { get; init; }

    }

    public static void Main()

    {

        //Func and action 

        Func<int, int, int> sum = (a, b) => a + b;

        Console.WriteLine(sum(10,20).ToString());

        Action<string,string> action = (firstName, lastName) => Console.WriteLine(string.Format("My name is {0} {1}.", firstName, lastName));

        action("tejas", "trivedi");

        //Till here

        // Use of record

        Test1 obj = new Test1()

        {

            Name = "test"

        };

        // obj.Name = "Test" This can not be done as this is init accessor property. So that record type is used to overcome this issue.  

        var member = new Member()

        {

            ID = 1,

            FirstName = "Tejas",

            LastName = "Trivedi",

            Address = "Ahmedabad"

        };

        var newMember = member with { ID = 2 };

        Console.WriteLine(member.ToString());

        Console.WriteLine(newMember.ToString());

        // till here

    }

}