C# Access Specifier - protected

using System;

namespace Console_AccessSpecifierProtected

{

    class Student

    {

        protected int age = 20;

        protected void ShowAge()

        {

            Console.WriteLine("Protected age accessible inside its own class, age: {0}", age);

        }

    }

    class ScienceStudent : Student

    {

        public void ShowProtectedAge()

        {

            // derive class can access protected method of parent class

            this.ShowAge(); 

            Console.WriteLine("Protected age accessed by derived class method: {0}", age);

            int AgeChanged = age + 10;

            Console.WriteLine("Changed age:{0}", AgeChanged);

            

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            /*Program class is not derived class of Student class.

             * So, it cannot access protected member of Student class.

             * For example, Intellisense will not show age.

             */

            ScienceStudent ss = new ScienceStudent();

            ss.ShowProtectedAge();

            /* Parent class reference variable can refer to its derived class objects. */

            Student student = new ScienceStudent();

            Console.WriteLine(student.GetHashCode());

            /* But all members of student are protected

             * so, student object cannot access them in Program class

             * But the derived class objects can access the members of the Parent class.

             * So, we can create a derive class and access Parent class members through child class object.

             */

            Console.Read();

        }

    }

}

OUTPUT

Protected age accessible inside its own class, age: 20

Protected age accessed by derived class method: 20

Changed age:30

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