@skyscraper1990
thank you for your C#, spent 2 days trying to GET data even though I could POST. Converted yours to VB.NET and worked first go. 
Public Sub findUserTwitter(ByVal resource_url As String, ByVal screen_name As String)
''---*** oauth application keys you get by creating your app at dev.twitter.com----***----
Dim oauth_token = "XYZ"
''"insert here...";
Dim oauth_token_secret = "XYZ"
''"insert here...";
Dim oauth_consumer_key = "XYZ"
'' = "insert here...";
Dim oauth_consumer_secret = "XYZ"
'' = "insert here...";
'' oauth implementation details
Dim oauth_version = "1.0"
Dim oauth_signature_method = "HMAC-SHA1"
' unique request details
Dim oauth_nonce = Convert.ToBase64String(New ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()))
Dim timeSpan = DateTime.UtcNow - New DateTime(1970, 1, 1, 0, 0, 0, _
0, DateTimeKind.Utc)
Dim oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString()
' create oauth signature
Dim baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" + "&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&screen_name={6}"
Dim baseString = String.Format(baseFormat, oauth_consumer_key, oauth_nonce, oauth_signature_method, oauth_timestamp, oauth_token, _
oauth_version, Uri.EscapeDataString(screen_name))
baseString = String.Concat("GET&", Uri.EscapeDataString(resource_url), "&", Uri.EscapeDataString(baseString))
Dim compositeKey = String.Concat(Uri.EscapeDataString(oauth_consumer_secret), "&", Uri.EscapeDataString(oauth_token_secret))
Dim oauth_signature As String
Using hasher As New HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey))
oauth_signature = Convert.ToBase64String(hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)))
End Using
' create the request header
Dim headerFormat = "OAuth oauth_nonce=""{0}"", oauth_signature_method=""{1}"", " + "oauth_timestamp=""{2}"", oauth_consumer_key=""{3}"", " + "oauth_token=""{4}"", oauth_signature=""{5}"", " + "oauth_version=""{6}"""
Dim authHeader = String.Format(headerFormat, Uri.EscapeDataString(oauth_nonce), Uri.EscapeDataString(oauth_signature_method), Uri.EscapeDataString(oauth_timestamp), Uri.EscapeDataString(oauth_consumer_key), Uri.EscapeDataString(oauth_token), _
Uri.EscapeDataString(oauth_signature), Uri.EscapeDataString(oauth_version))
ServicePointManager.Expect100Continue = False
' make the request
Dim postBody = "screen_name=" + Uri.EscapeDataString(screen_name)
'
resource_url += "?" + postBody
Dim request As HttpWebRequest = DirectCast(WebRequest.Create(resource_url), HttpWebRequest)
request.Headers.Add("Authorization", authHeader)
request.Method = "GET"
request.ContentType = "application/x-www-form-urlencoded"
Dim response = DirectCast(request.GetResponse(), HttpWebResponse)
Dim reader = New StreamReader(response.GetResponseStream())
Dim objText = reader.ReadToEnd()
End Sub
