static void Main(string[] args)
{
//implicitly implemented methods can be invoked implicitly and explicitly
//implicit
Sample sample = new Sample();
//sample.Foo();
//sample.Foo1();
sample.Foo2();
sample.ClsMethod();
//explicitly implemented methods can be invoked ONLY explicitly
//explicit invocation
IA ia = sample;
ia.Foo1();
ia.Foo();
IB ib = sample;
ib.Foo();
ib.Foo2();
}