using System;
public class Customer {
	public string FirstName { get; set; }
}

public class Test
{
	public static void Main()
	{
		var customer = new Customer() { FirstName = "Simon" };
		Example(ref customer);
		Console.WriteLine(customer.FirstName);
	}
	
    public static void Example(ref Customer customer) {
    	customer = new Customer() { FirstName = "CHANGED" };
    }
}