Error CS1579 Foreach statement cannot operate on variables of type ‘Student’ because ‘Student’ does not contain a public instance or extension definition for ‘GetEnumerator’ In this example, members of these interfaces are derece explicitly called, but they are implemented to support the use of foreach (for each in Visual Basic) https://paxtonsadhj.dreamyblogs.com/28378526/bir-İnceleme-c-ienumerator-kullanımı