C#

public interface ICustomer
{
   string Name {get;}   
}

public interface IProduct
{
   string Name {get;}
}

public interface IOrder
{
   ICustomer Customer {get;}
   IProduct Product {get;}
   int Quantity {get;}
}

namespace FormConstructorParam
{
	public class OverloadedConstructor : System.Windows.Forms.Form
	{
		private System.ComponentModel.Container components = null;

		private int _value;

		public OverloadedConstructor()
		{
			InitializeComponent();
		}

		public OverloadedConstructor(int someValue)
		{
			InitializeComponent();
			_value = someValue;
		}

               // additional details omitted...
	}
}

OverloadedConstructor oneForm = new OverloadedConstructor(1);

OverloadedConstructor anotherForm  = new OverloadedConstructor();