Domain Validation function

can any one tell me ?.How shold i validate Domain name using Navigte function of webbrowser.let me know the idea.Any help would be highly appreciated.

Validate a domain name, or URL?

MS's suggestion for URL validation: http://support.microsoft.com/kb/943522

i simple want to validate an address other than to pass it to the web engine and see if it returns a page.Kindly let me know the Idea.i have got the way on the web.but i don't want to use using Api.So kindly let me know the idea.

Code:

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Private Declare Function IsValidURL Lib "urlmon" (ByVal pBC As Long, _
    url As Byte, ByVal dwReserved As Long) As Long
   
Dim url As String
Dim b() As Byte

url = "http://www.vb2themax.com/default.asp"
' We need this because we're passing a Unicode string
b = url & vbNullChar

If IsValidURL(0, b(0), 0) = 0 Then   
    ' valid URL
Else
    ' invalid URL
End If

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Found this in my codebank,

Code:

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Option Explicit
Private Const S_FALSE = &H1
Private Const S_OK = &H0
Private Declare Function IsValidURL Lib "URLMON.DLL" (ByVal pbc As Long, ByVal szURL As String, ByVal dwReserved As Long) As Long

Private Function IsGoodURL(ByVal sURL As String) As Boolean
    'The IsValidURL always expects a UNICODE string, but whenever
    'VB calls an API function, it converts the strings to ANSI strings.
    'That's why we're going to use a trick here. Before calling the function,
    'We're going to convert the unicode string to unicode so we get a double
    'unicode string.
    'Before VB calls the API function, it converts our double unicode string
    'to a normal unicode string; exactely what IsValidURL is expecting.
    sURL = StrConv(sURL, vbUnicode)
    'Now call the function
    IsGoodURL = (IsValidURL(ByVal 0&, sURL, 0) = S_OK)
End Function


Private Sub Form_Load()
    MsgBox "Is valid URL: " & CStr(IsGoodURL("http://www.ex-designz.net"))
End Sub

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Where this IsValidURL Declaration is available.means in which file Mapi32.txt, win32api.text or apiload.text.let me know the idea.Kindly find the attachment also.
additional Still i am facing issue during web validation.here is the following code what i have written.

Code:

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Private Declare Function IsValidURL Lib "URLMON.DLL" (ByVal pbc As Long, ByVal szURL As String, ByVal dwReserved As Long) As Long


If txtWebSite.Text <> "" Then  'Test for empty Domain
  If Not PortalValidate(txtWebSite.Text) = True Then
      MsgBox ("Domain Format is InCorrect")
      CheckInput = False
      txtWebSite.SetFocus
      Exit Function
  End If
 End If
 

Public Function PortalValidate(ByVal SURL As String) As Boolean
Dim ok As Boolean
SURL = StrConv(SURL, vbUnicode)
ok = (IsValidURL(ByVal 0&, SURL, 0) = S_OK)
If ok = True Then
PortalValidate = True
Exit Function
End If
PortalValidate = False
End Function

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