Answer Posted / sukriya

You can use private only with a nested class, one that is
defined within another class. The result is that the
private class is accessible only from within the containing
class
try this code
public class BaseClass
{
public virtual void TraceSelf()
{
Console.WriteLine("BaseClass");
Privateclass pc = new Privateclass();
pc.Self();
}

private class Privateclass
{
public void Self()
{
Console.WriteLine("PrivateClass");
}
}

}
public class SubClass : BaseClass
{
public override void TraceSelf()
{
//Privateclass pc = new Privateclass();
//pc.Self();
Console.WriteLine("SubClass");
}
}
static void Main(string[] args)
{
BaseClass obj = new BaseClass();
obj.TraceSelf(); // Outputs "BaseClass"

SubClass obj2 = new SubClass();
obj2.TraceSelf();

Console.ReadKey();
}
this is the main Program for the code

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