Web Service invoke as NT User

[backwards15]

** This is the windows form code **

Private Sub btn_log_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles btn_log.Click
Dim msg As String
Dim ws As New ADWS.Service
msg = "testing this mail message"
Dim mail As New Net.Mail.SmtpCl ient
mail.Host = "exchange server"
mail.UseDefault Credentials = True
'mail.Send(getm ail.GetCurrentU serEmail, "[e-mail]. nz", "call
request", msg)
MessageBox.Show (ws.GetCurrentU serEmail)
End Sub
** This is the webservice code **
<WebMethod()_
Public Function GetCurrentUserE mail() As String
Dim dSearch As DirectorySearch er = New DirectorySearch er()
dSearch.SearchR oot = New DirectoryEntry( "LDAP://DC=Domain
name,DC=co,DC=n z", "CN=user,OU=Use rs,DC=domain name,DC=co,DC=n z",
"password")
dSearch.Filter = "(&(objectCateg ory=User)(samAc countName=" +
Environment.Use rName + "))"
Dim sResult As SearchResult = dSearch.FindOne ()
Dim currentUser As DirectoryEntry = sResult.GetDire ctoryEntry()
Return currentUser.Pro perties("mail") .Value.ToString ()
End Function
When I try to run ws.getcurrentus eremail() it invokes the web service
as IUSR_Computerna me.
How ever if I run the web service directly it runs as my account
domain
\username
How do I get the web service to run from the windows app as the
locally logged on user?