static void ChangeProperties(ReferenceType instance)
{
instance.Number = 29;
instance.String = "twentynine";
Console.WriteLine("reference in method: {0} {1}", instance.Number, instance.String);
}
static void Main(string[] args)
{
var referenceInstance = new ReferenceType();
referenceInstance.Number = 1;
referenceInstance.String = "one";
ChangeProperties(referenceInstance);
Console.WriteLine("reference: {0} {1}", referenceInstance.Number, referenceInstance.String);
var valueInstance = new ValueType();
valueInstance.Number = 1;
valueInstance.String = "one";
ChangeProperties(valueInstance);
Console.WriteLine("value: {0} {1}", valueInstance.Number, valueInstance.String);
}