Public Overloads Function IndexOf( _
   ByVal item As CallbackResult, _
   ByVal index As Integer, _
   ByVal count As Integer _
) As Integer

Dim instance As CallbackResultCollection
Dim item As CallbackResult
Dim index As Integer
Dim count As Integer
Dim value As Integer
 
value = instance.IndexOf(item, index, count)

public int IndexOf( 
   CallbackResult item,
   int index,
   int count
)