Compilation error (line 10, col 28): The type or namespace name 'IPay' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 12, col 22): The type or namespace name 'Product' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 19, col 32): The type or namespace name 'Product' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 1, col 1): Program does not contain a static 'Main' method suitable for an entry point
Compilation error (line 16, col 34): The type or namespace name 'Product' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 29, col 22): The type or namespace name 'Product' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 46, col 22): The type or namespace name 'Product' could not be found (are you missing a using directive or an assembly reference?)