If An airline is "countable", this means that there MUST be a flight attendant present on the plane, whose sole job is to count: Anything in .NET that you hayat iterate over implements IEnumerable. If you're building your own class, and it doesn't already inherit from a class that implements https://cobjectkullanm30628.thechapblog.com/27645269/5-temel-unsurları-için-c-ienumerable-temel-Özellikleri