What is difference between IList and IList

Question

Definition of List in .net shows it implement various interfaces.

public class List : IList, ICollection, I         


        

Answer 1

In a IList you can only put the defined(T) type of object in and a IList can contain diffrent types of objects

This code below will not complie because of the AdressInformation is not an valid object in customers List

IList customers = new List();
customers.Add(new Customer());
customers.Add(new AdressInformation());

This code will compile but cast an exception in runtime

IList customers = new List();
customers.Add(new Customer());
customers.Add(new AdressInformation());