static void Main(string[] args)
{
myclass ob1 = new myclass();
myclass ob2 = new myclass();
ob1.set_a(10);
ob2.set_a(99);
Console.WriteLine("Gia tri a cua doi tuong ob1: {0}", ob1.get_a());
Console.WriteLine("Gia tri a cua doi tuong ob2: {0}", ob2.get_a());
Console.ReadLine();
}
static void Main(string[] args)
{
// khai bao cac doi tuong moi
myclass ob1 = new myclass();
myclass ob2 = new myclass();
ob1.set_a(10);
ob2.set_a(99);
Console.WriteLine("gia tri a cua ob1: {0}", ob1.get_a());
Console.WriteLine("gia tri a cua ob12: {0}", ob2.get_a());
Console.ReadLine();
}