How to force/Manually add authenticaion to POST WebRequest

I was not given a type of authorization. But that is a really good question. I have never done this before and I did not know there were different types. I just checked and it is not listed in the spec.

I have requested that the authorization type be identified. I should hear back this morning.

It is basic authentication.

On site elsewhere now. Will try later today and let you know. Thanks. It looks correct to me.

Ok. Thank you.  I ran into an error. Please see the attached image.

Also when I read the code earlier today, I didn't notice that there does not seem to be a RESPONSE component. In my scenario, my code is to POST string to a web sever and listen for the RESPONSE. At the moment I do not know how to tell if the POST was successful. How would I add that to the code?
Thanks,
pat
WebClient-error.png

The length of x is 6784 characters. Task manager indicates that 2.5 GB on 5.8 GB of memory are being used. I will reboot and try again.

Unfortunately, I do not have the option of testing with a short string. The Company receiving the data is a large multinational and they are a bit inflexible.

The string I am sending is a XML notification of shipment. The bulk of its length is due the signature image which I converted to Base 64.

I apologize for the delay. There was a windows update that got hung on this workstation.

After the reboot, the same error occurred.

The code to convert the image to base 64 seems straight forward to me. I have attached the string, x, that is being posted. To that string I have added a few carriage returns to isolate the signature text. I have also tried to find all references that might identify the companies involved. I have changed every reference I could identify.

In addition to the error there is something I do not understand. What is Console.ReadLine doing? Is it reading a response somehow? If so I need to read that response into a string variable and compare it to the possible response from the server. I haven't been given those responses yet but I am sure I will receive them at some point.

Thank you very much for our continued interest. I would not be making any progress without your assistance.
InfoTobePosted.txt

OK. Thanks for the explanation. I did the exact same thing when I started this program. I first built it as a console app. I tested the console app there first to ensure I had the ServiceContract, DataContract and DataMembers correct. I had never done this before. I built a Client console app for testing. Testing yielded the results I expected. I did not realize I could use a console command in a non console app.
Anyway I tried several different methods to Build a response for the WebClient in the code you shared but was not successful. I would like the response to read directly into a string variable. How would I do that?

Thank you for all your assistance. I have finally arrived at a solution. Below is my final code for POST with BASIC Authentication

Private Sub PostXMLfile(ByVal x As String, ByRef WebString As String)
        Dim username As String = "username"
        Dim password As String = "password"
        Dim request As HttpWebRequest
        Dim response As HttpWebResponse = Nothing
        Dim reader As StreamReader
        Dim xmlDocAsStr As String = x
        Dim byteArray(xmlDocAsStr.Length - 1) As Byte
        Dim objUTF8Encoding As New UTF8Encoding
        Dim Uri As String = "https://test.com/invoke/B2BShipmentDeliveryStatus.externalCarriers.services:receiveConfirmation"
        Dim postStream As Stream = Nothing
        'Some code from: https://developer.yahoo.com/dotnet/howto-rest_vb.html
        '
        Try
            ' Create the web request 
            request = DirectCast(WebRequest.Create(Uri), HttpWebRequest)
            byteArray = objUTF8Encoding.GetBytes(xmlDocAsStr)
            request.Method = "POST"
            request.ContentLength = byteArray.Length
            request.ContentType = "text/xml"
            ' Add authentication to request  
            request.Credentials = New NetworkCredential(username, password)
            '
            Try
                postStream = request.GetRequestStream()
                postStream.Write(byteArray, 0, byteArray.Length)
            Finally
                If Not postStream Is Nothing Then postStream.Close()
            End Try
            '' Get response  
            response = DirectCast(request.GetResponse(), HttpWebResponse)
            reader = New System.IO.StreamReader(response.GetResponseStream(), Encoding.ASCII)
            WebString = reader.ReadToEnd()
        Finally
            If Not response Is Nothing Then response.Close()
        End Try

    End Sub

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Thanks again.
pat