Consider the code snippet.
IList<String> obj=new List<string>();
IEnumerable<Object> obj1 = obj;
But if i write ICollection<Object> obj2 = obj; it throws me a compile time error.
Cannot implicitly convert type '
System.Collections.Generic.IList<string>' to 'System.Collections.Generic.ICollection<object>'.
Why is this behavior since List<T> implements both IEnumerable<T> and ICollection<T> and also IList<T> is defined as
public interface IList<T> : ICollection<T>, IEnumerable<T>, IEnumerable
{
T this[int index] { get; set; }
int IndexOf(T item);
void Insert(int index, T item);
void RemoveAt(int index);
}