using System;

public class Program

{

    public void Main()

    {

        Duck d =  Duck.Create<Donald>("Hello  World");

        Console.WriteLine(d.DucksParam0);

    }

}

public abstract class Duck {

​

    private string _DucksParam0;

    public  string  DucksParam0  {

        get  {

            return  _DucksParam0;

        }

    }

​

    // Using protected, this constructor can only be used within the class instance

    // or a within a derived class

    protected Duck() { }

​

    public static DuckT Create<DuckT>(string param0)

        where DuckT : Duck

    {

        DuckT theDuck = (DuckT)Activator.CreateInstance(typeof(DuckT));

​

        // This is now your "implicit" constructor

        theDuck._DucksParam0 = param0;

​

        return theDuck;

    }

​

}

​

public class Donald : Duck {

}