using System;

abstract class Module
{
    public Options Params;
}

abstract class Options { }

// implementation
class MyModule : Module
{
    public new MyOptions Params = new MyOptions();
}

class MyOptions : Options
{
    public string Param1;
}

public class Test
{
	public static void Main()
	{
		var m = new MyModule();
		if(m.Params is MyOptions)
		{
			Console.WriteLine("yes");
		}
	}
}