Issue call webservice - html

Question

Hi I am trying to communicate with a webservice in my asp.net page in my code behind (vb.net) when i make the call I get a 401 unauthorised error however when i try the same call though a simple html page it works.
here is my simple html page
<form method="post" action="https://mycallingwebpage.co.uk/login">
<input type="submit">
</form>
this works fine and returns what i would expect.
however in my vb.net code this doesn't work.
Public Function mylogin(ByVal ServiceProfile) As String
Dim xmldoc As New Xml.XmlDocument
Try
myWebClient = New WebClient
myWebClient.Headers.Add("Content-Type", "text/plain")
Dim bytRetData As Byte() = myWebClient.DownloadData("https://mycallingwebpage.co.uk/login" & ServiceProfile)
Catch ex As Exception
End Try
End Function
I have now made some steps forward.
Further to my earlier question above i am still not able to make the call. I have found that if i make a call to the http url it works but calling the the https url it does not - this ajax call below does work for me - so effectively what do i need to do to convert this code below into a webclient call in vb.net? - this needs to work for https
$.ajax({
type: "POST",
contentType: 'application/x-www-form-urlencoded',
dataType: "application/xml",
crossDomain: true,
data: {'login' : encodeURIComponent('user'),'password' : encodeURIComponent('password')} ,
url: "https://myURL.com",
success: doThis,
error: doThat
});

Answer 1

you have to "authorize" yourself before accessing the WS. You are probably missing an Authorization header. Sorry, I'm not much of a VB expert, but it should be something like this:
myWebClient.Headers.Add("Authorization", "Basic " + ADD_UR_SECRET_HERE)
BTW, don't forget to encode your secret token using a Base64 Encoder before adding it to the headers.
Hope it helped.