Implementation of IList with fixed number of items

Hi, I was looking for a good implementation of IList. The MSDN reference link https://msdn.microsoft.com/en-us/library/system.collections.ilist%28v=vs.110%29.aspx has a member declaration of 8 items

        private object[] _contents = new object[8];

What if I wanted to change this to one which is unbounded? Also, the GetEnumerator is not implemented. Is there a good article that has IList implemented along with GetEnumerator?

Thanks