<SerializableAttribute> _
<HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort := True)> _
Public Class HashSet(Of T) _
    Implements ICollection(Of T), IEnumerable(Of T),  _
    IEnumerable, ISerializable, IDeserializationCallback

Dim instance As HashSet(Of T)

[SerializableAttribute]
[HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
public class HashSet<T> : ICollection<T>, IEnumerable<T>, 
    IEnumerable, ISerializable, IDeserializationCallback

[SerializableAttribute]
[HostProtectionAttribute(SecurityAction::LinkDemand, MayLeakOnAbort = true)]
generic<typename T>
public ref class HashSet : ICollection<T>, 
    IEnumerable<T>, IEnumerable, ISerializable, IDeserializationCallback

J# supports the use of generic APIs, but not the declaration of new ones.

JScript does not support generic types or methods.