How to access private function of a class in another class in c#?

I am new to c# programming and i know public data member of class is accessible from another class.Is there any way i can access private function from another class?

This is what i have tried.please help me out.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication7
{
    class Program
    {
        private class Myclass
        {
            private int Add(int num1, int num2)
            {
                return num1 + num2;
            }
        }
        static void Main(string[] args)
        {
            Myclass aObj = new Myclass();
            //is there any way i can access private function
        }
    }
}