Public Function BeginCreateSession( _
   ByVal requestHeader As RequestHeader, _
   ByVal clientDescription As ApplicationDescription, _
   ByVal serverUri As String, _
   ByVal endpointUrl As String, _
   ByVal sessionName As String, _
   ByVal clientNonce() As Byte, _
   ByVal clientCertificate() As Byte, _
   ByVal requestedSessionTimeout As Double, _
   ByVal maxResponseMessageSize As UInteger, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

public IAsyncResult BeginCreateSession( 
   RequestHeader requestHeader,
   ApplicationDescription clientDescription,
   string serverUri,
   string endpointUrl,
   string sessionName,
   byte[] clientNonce,
   byte[] clientCertificate,
   double requestedSessionTimeout,
   uint maxResponseMessageSize,
   AsyncCallback callback,
   object asyncState
)