Question

How to use private and protected variables in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    public class MyClass
    {
        private int private_x;

        protected int protected_n;

        int TheNumber()
        {
            private_x = 300;

            return private_x;
        }

        public int GetNumber()
        {
            return TheNumber();
        }
    }

    public class MySubClass : MyClass
    {
        public int GetNumberProtected()
        {
            protected_n = 13;
            //private_x = 100; // Error CS0122  'MyClass.private_x' is inaccessible due to its protection level (it's private)

            return protected_n;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            MyClass myclass = new MyClass();

            int n = myclass.GetNumber();
            Console.WriteLine(n);
            
            //n = myclass.TheNumber(); // Error CS0122  'MyClass.TheNumber()' is inaccessible due to its protection level (return private)

            MySubClass mysubclass = new MySubClass();

            n = mysubclass.GetNumber();
            Console.WriteLine(n);

            n = mysubclass.GetNumberProtected(); 
            Console.WriteLine(n);
        }
    }
}


/*
run:
    
300
300
13

*/

 

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