Definition of event delegate you should use if you want to receive the OnHold event.
[Visual Basic]
Public Delegate Sub OnHold( _
ByVal Sender As Object, _
Byval e As OnReferCallArgs_
)
[C#]
public delegate void OnHold(
object Sender,
OnReferCallArgs e
);
Namespace: TAPIEx
Assembly: TAPIEx.Net.Dll