using System.Collections; using System.Collections.Specialized; namespace System.Configuration { internal sealed class ReadOnlyNameValueCollection : NameValueCollection { internal ReadOnlyNameValueCollection(IEqualityComparer equalityComparer) : base(equalityComparer) { } internal ReadOnlyNameValueCollection(ReadOnlyNameValueCollection value) : base(value) { } internal void SetReadOnly() { base.IsReadOnly = true; } } }