What Are Properties?

• Properties are methods that protect access to class members.
• Properties are class members that provide access to elements of an object or class.
• Protect access to the state of object.
•  It likes fields, but they operate much like methods.
• The get and set statements are called accessors.
• Fields can’t be used in Interfaces so properties are the solution.

Syntax:

        private double balance;
        public double Balance
        {
            get
            {
                return balance;
            }
            set
            {
                balance = value;
            }
        }

Example:

    public class Employee
    {
        private double salary;
        private double taxRate = 0.05;
        

        public string Name { get; set; }
        public double YearOfExp { get; set; }

        public double YearlyMedicalAllowance {get; private set;}

        public Employee()
        {
            this.YearlyMedicalAllowance = 30000;
        }

        public double Salary
        {
            get { return salary; }
            set {
                if (value > 200000)
                    salary = value - value * taxRate;
                else
                    salary = 5000;
            }
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            Employee objEmployee = new Employee();
            objEmployee.Name = "Rafiqul Islam";
            objEmployee.YearOfExp = 7;
            objEmployee.Salary = 5000;
            
            Console.WriteLine(objEmployee.Name);
            Console.WriteLine("Salary: " + objEmployee.Salary);
            Console.WriteLine("Yearly Madical Allowance" + objEmployee.YearlyMedicalAllowance);

            Console.ReadLine();
        }
    }

Static Constructor

• Instance constructors are used to initialize an object
• Static constructors are used to initialize a class
• Will only ever be executed once
• Run before the first object of that type is created.
• Have no parameter
• Do not take an access modifier
• May co-exist with a class constructor

Syntax:

        class Lion
        {
            static Lion()
            {
                // class-specific initialization
            }
        }

Example:

class RandomNumberGenerator
{
private static Random randomNumber;
public static string AuthorName { get; set; }

public RandomNumberGenerator(String msg)
{
Console.WriteLine(msg);
//Constructor for object
}

//Static constructor
static RandomNumberGenerator()
{
AuthorName = “Mahedee Hasan”;
randomNumber = new Random();
}

public int Next()
{
return randomNumber.Next();
}
}

class Program
{
static void Main(string[] args)
{
RandomNumberGenerator randomNumber
= new RandomNumberGenerator(“Generate 10 Random Number”);

for (int i = 0; i < 10; i++) { Console.WriteLine(randomNumber.Next()); } Console.WriteLine(“Author Name: ” + RandomNumberGenerator.AuthorName); Console.ReadKey(); } } [/csharp]