static void Main(string[] args)
{
Console.WriteLine($"Call through B: {ClassB.Add(1, 2)}");
Console.WriteLine($"Call through B to A: {ClassB.Add2(1, 2)}");
Console.WriteLine($"Call through C (B): {ClassC.AddB(1, 2)}");
Console.WriteLine($"Call through C (B): {ClassC.AddB2(1, 2)}");
Console.ReadLine();
}
static void Main1(string[] args)
{
var dd = default(KeyValuePair <int, int>);
bool sd = default(KeyValuePair <int, int>).Equals(new KeyValuePair <int, int>(0, 0));
ClassB classB = new ClassB();
ClassC classC = new ClassC();
classB.Test();
classC.Test();
((ClassA)classB).Test();
((ClassA)classC).Test();
Console.Read();
}