void IList.RemoveAt(int index) => ThrowHelper.ThrowCollectionIsReadonly();
void IList.Remove(object value) => ThrowHelper.ThrowCollectionIsReadonly();
void IList.Insert(int index, object value) => ThrowHelper.ThrowCollectionIsReadonly();
void IList.Clear() => ThrowHelper.ThrowCollectionIsReadonly();
int IList.Add(object value) => ThrowHelper.ThrowCollectionIsReadonly <int>();
object IList.this[int index]
{
get { return(this[index]); }
set { ThrowHelper.ThrowCollectionIsReadonly(); }
}