#715 – Private Members Are Not Visible in a Derived Class

Class members declared with an accessibility level of private are accessible only within the code for the class in which they are declared.  They are not accessible from a derived class.

In the example below, dogData is a private member of the Dog class, so it is not visible within the Terrier class (which inherits from Dog).

    public class Dog
        // Stuff that's clearly public
        public string Name { get; set; }
        public int Age { get; set; }

        private int dogData;

        public Dog(string name, int age)
            Name = name;
            Age = age;
            dogData = 12;
    public class Terrier : Dog
        public Terrier(string name, int age) : base(name, age)

        public void Snarl()
            // Compiler error: dogData is inaccessible due to its protection level

About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

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