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Sample1_General.cs：Code Content

							using System;
namespace Sample1_General
{
	public interface ICustomerManager
	{
		Customer getCustomer(int id);
		ValidationResult validate(Customer cust);
	}
	[Serializable] 
	public class ValidationResult 
	{
		public ValidationResult (bool ok, String msg) 
		{
			Console.WriteLine("ValidationResult.ctor: Object created");
			this.Ok = ok;
			this.ValidationMessage = msg;
		}
		public bool Ok;
		public String ValidationMessage;
	}
	[Serializable]
	public class Customer 
	{
		public String FirstName;
		public String LastName;
		public DateTime DateOfBirth;
		public Customer() 
		{
			Console.WriteLine("Customer.ctor: Object created");
		}
		public int getAge() 
		{
			Console.WriteLine("Customer.getAge(): called for Customer " + FirstName + " born on " + DateOfBirth.ToShortDateString());
			TimeSpan tmp = DateTime.Today.Subtract(DateOfBirth);
			return tmp.Days / 365; // rough estimation
		}
	}
}

						