public class Animal 
{ 
   PRivate Animal() 
   {       Console.WrITeLine("i am animal"); 
   } 
} 
public class Dog : Animal  {      
}

class Program 
{
   static void Main(string[] args) 
   { 
     Animal animal = new Animal(); 
   } 
} 
public class Animal 
{ 
   private Animal() 
   { 
     Console.WriteLine("i am animal"); 
   } 
}

public class PrivateConClass
{
    private static PrivateConClass pcc;
    private PrivateConClass()
    {
        Console.WriteLine("This private constructure function. So you cannot create an instance of this class.");
    }
    public static PrivateConClass CreatePcc()
    {
        pcc = new PrivateConClass();
        return pcc;
    }
    public static void ShowStaticMethod()
    {
        Console.WriteLine("This is a static method. Just be called by Class name.");
    }
    public void ShowMethod()
    {
        Console.WriteLine("This is a Nonstatic method. Just be called by private static instance pcc.");
    }
}
class Program
{
    static void Main(string[] args)
    {   
        PrivateConClass pcc = PrivateConClass.CreatePcc();
        pcc.ShowMethod();
        PrivateConClass.ShowStaticMethod();
    }
}