When I try to compile the following code I recieve the error:
error BC30541 Name 'vbNullChar' is not declared

Can anyone help?

Thanks,
  Steve

Here's the code.

Namespace SteveUtils
		Public Class Message
			Private nRet As Integer
			Private strServer As String
			Private strFrom As String
			Private strTo As String
			Private strMsg As String
 
		Private Declare Unicode Function NetMessageBufferSend 
Lib "NetAPI32.dll" _
         		(ByVal Server As String, ByVal SendTo As String, 
ByVal From As String, _
         		ByVal Message As String, ByVal MsgLen As Integer) 
As Integer

		Public Function Send() as Integer
			Dim strServer As String
			Dim strFrom As String
			Dim strTo As String
			Dim strMsg As String
			
			strFrom = "Helpdesk Manager"
			strTo = "boris"
			strServer = vbNullChar
			strMsg = "Test Assembly Message"

			Return NetMessageBufferSend(strServer, strTo, 
strFrom, strMsg, strMsg.Length * 2)
		End Function

	End Class
End NameSpace