Passing values to an XML file - asp.net

Question

I have a web application that sends the contents of a form to another site. This other i can pass the log in information without issue and the page authenticates alright but I don't know how to pass an array of information that is required at the other end. The array contain setting names and their respective setting values. I have this working in PHP but don't know how to do it in ASP.net
In PHP I use this for the array:
$aParams = array(
'customeremailaddress' => 'mr.test#test.com',
'customername' => 'mr test',
'exlibrisfile' => '#/ePubs/Ex-Libris.png'
);
And to send the array:
curl_setopt($rCurl, CURLOPT_POSTFIELDS, $aParams);
Here is the VB code I have ended up with that returns a 400 bad request error:
Dim postString As String = String.Format("customeremailaddress={0}&customername={1}&referenceid={2}&languagecode={3}&expirydays={4}", customeremailaddress, customername, referenceid, languagecode, expirydays)
Dim postBytes As Byte() = Encoding.UTF8.GetBytes(postString)
webRequest__1.ContentLength = postBytes.Length
Dim requestStream As Stream = webRequest__1.GetRequestStream()
requestStream.Write(postBytes, 0, postBytes.Length)
The complete code:
Public Sub TestConn()
Dim customeremailaddress As String = "mr.test#test.com"
Dim customername As String = "mr test"
Dim referenceid As String = "ordertest123"
Dim languagecode As String = "1043"
Dim expirydays As String = "30"
Dim UserName As String = "testusername"
Dim password As String = "testpassword"
Dim siteCredentials As New NetworkCredential(UserName, password)
Dim URLAuth As String = "http://service.someurl.com/process.xml"
Dim postString As String = String.Format("customeremailaddress={0}&customername={1}&referenceid={2}&languagecode={3}&expirydays={4}", customeremailaddress, customername, referenceid, languagecode, expirydays)
Dim postBytes As Byte() = Encoding.UTF8.GetBytes(postString)
Const contentType As String = "application/x-www-form-urlencoded"
System.Net.ServicePointManager.Expect100Continue = False
Dim cookies As New CookieContainer()
Dim webRequest__1 As HttpWebRequest = TryCast(WebRequest.Create(URLAuth), HttpWebRequest)
webRequest__1.Method = "POST"
webRequest__1.ContentType = contentType
webRequest__1.CookieContainer = cookies
webRequest__1.ContentLength = postBytes.Length
webRequest__1.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1"
webRequest__1.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
webRequest__1.Referer = "http://service.someurl.com/process.xml"
webRequest__1.Credentials = siteCredentials
Dim requestStream As Stream = webRequest__1.GetRequestStream()
requestStream.Write(postBytes, 0, postBytes.Length)
Dim requestWriter As New StreamWriter(webRequest__1.GetRequestStream())
Dim responseReader As New StreamReader(webRequest__1.GetResponse().GetResponseStream())
Dim responseData As String = responseReader.ReadToEnd()
responseReader.Close()
webRequest__1.GetResponse().Close()
End sub

Answer 1

This is my code to post data to another url.
Text is the form url-econded string.
Hope this can help
C#
private string PostData(string text)
{
WebRequest request = WebRequest.Create(url);
request.Method = "POST";
byte[] byteArray = Encoding.UTF8.GetBytes(text);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
using (Stream dataStream = request.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
}
using(WebResponse response = request.GetResponse())
using (Stream dataStream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(dataStream))
{
return reader.ReadToEnd();
}
}
VB.NET
Private Function PostData(text As String) As String
Dim request As WebRequest = WebRequest.Create(url)
request.Method = "POST"
Dim byteArray As Byte() = Encoding.UTF8.GetBytes(text)
request.ContentType = "application/x-www-form-urlencoded"
request.ContentLength = byteArray.Length
Using dataStream As Stream = request.GetRequestStream()
dataStream.Write(byteArray, 0, byteArray.Length)
End Using
Using response As WebResponse = request.GetResponse()
Using dataStream As Stream = response.GetResponseStream()
Using reader As New StreamReader(dataStream)
Return reader.ReadToEnd()
End Using
End Using
End Using
End Function