public void InterfacesTest()
{
Implementation imp = new Implementation();
IInterface1 i1 = imp;
IInterface2 i2 = imp;
Console.WriteLine("A call from implementation directly");
imp.DoSmth();
Console.WriteLine("A call from interface1 ");
i1.DoSmth();
Console.WriteLine("A call from interface2 ");
i2.DoSmth();
}