Login Function

Function Check(username As String, pass As String)
        Try
            Dim postData As String = "username=" & username & "&password=" & pass
            Dim req As HttpWebRequest
            req = WebRequest.Create("https://www.instagram.com/accounts/login/ajax/")
            Dim res As HttpWebResponse
            Dim en As Byte() = Encoding.UTF8.GetBytes(postData)
            req.Method = "POST"
            req.ContentType = "application/x-www-form-urlencoded"
            req.Headers.Add("X-CSRFToken", "ZxEWIjHiwFGMxQVpB0L5nkLXriSs1wN4")
            req.Headers.Add("X-Instagram-AJAX", "1")
            req.Headers.Add("X-Requested-With", "XMLHttpRequest")
            req.Headers.Add("Cookie", "rur=ATN; csrftoken=ZxEWIjHiwFGMxQVpB0L5nkLXriSs1wN4; mid=WRmszQALAAH3-sfP8J7hcMRCbK2L; ig_vw=1366; ig_pr=1")
            req.Referer = "https://www.instagram.com/"
            req.ContentLength = en.Length
            Dim ss As Stream = req.GetRequestStream
            ss.Write(en, 0, en.Length)
            ss.Close()
            res = req.GetResponse
            Dim re As New StreamReader(res.GetResponseStream)
            Dim ST = re.ReadToEnd
            TextBox1.AppendText(ST)
            If ST.Contains(My.Resources.{"authenticated": true, "user": true, "status": "ok"}) Then
                MsgBox("Login Good")
            Else
                MsgBox("Bad")
            End If
        Catch ex As Exception
            Return False
        End Try
     End Function