Get hidden input value on form POST after redirect to another page?

I’m using Visual Studio with asp.net, vb.net, and javascript in order to implement an API. I am editing sample code from Authorize.Net.

I need to pass the values of dataValue and dataDescriptor

<input type="hidden" name="dataValue" id="dataValue" />
<input type="hidden" name="dataDescriptor" id="dataDescriptor" />

to the next page after the form POSTS

    'This returns as EMPTY!!! right now
    Dim infoValue = Request.Form("dataValue")
    Dim infoDescriptor = Request.Form("dataDescriptor")

How can I pass these two hidden field values over to the next page?

FULL CODE

PaymentInfo.aspx

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="PaymentInfo.aspx.vb" Inherits="AuthorizeAccept.PaymentInfo" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

<!--
    This file is a standalone HTML page demonstrating usage of the Authorize.net
    Accept JavaScript library when integrated with your own payment form.

    For complete documentation for the Accept JavaScript library, see
    https://developer.authorize.net/api/reference/features/acceptjs.html
-->
<head runat="server">
    <title>Sample form</title>
</head>

<body>

<script type="text/javascript"
    src="https://jstest.authorize.net/v1/Accept.js"
    charset="utf-8">
</script>

<form id="paymentForm" runat="server"
    method="POST"
    action="PaymentProcess.aspx" >
    <input type="text" name="cardNumber" id="cardNumber" placeholder="cardNumber" value="4111111111111111"/> <br><br>
    <input type="text" name="expMonth" id="expMonth" placeholder="expMonth" value="12"/> <br><br>
    <input type="text" name="expYear" id="expYear" placeholder="expYear" value="2028"/> <br><br>
    <input type="text" name="cardCode" id="cardCode" placeholder="cardCode" value="123"/> <br><br>
    <input type="text" name="amount" id="amount" placeholder="cardCode" value="6.00"/> <br><br>
    <input type="text" name="accountNumber" id="accountNumber" placeholder="accountNumber"/> <br><br>
    <input type="text" name="routingNumber" id="routingNumber" placeholder="routingNumber"/> <br><br>
    <input type="text" name="nameOnAccount" id="nameOnAccount" placeholder="nameOnAccount"/> <br><br>
    <input type="text" name="accountType" id="accountType" placeholder="accountType"/> <br><br>
    <input type="hidden" name="dataValue" id="dataValue" />
    <input type="hidden" name="dataDescriptor" id="dataDescriptor" />
    <button type="button" onclick="sendPaymentDataToAnet()">Pay</button>
</form>

<script type="text/javascript">

function sendPaymentDataToAnet() {
    var authData = {};
    authData.clientKey = "6bpMZ759ELh6K3dAWx7MVNqyYX88zsN5R3zj7FChrwnYjTQ3bQ93TS7h6YjcE64M";
    authData.apiLoginID = "93cWyMh9Kd6G";

    var cardData = {};
        cardData.cardNumber = document.getElementById("cardNumber").value;
        cardData.month = document.getElementById("expMonth").value;
        cardData.year = document.getElementById("expYear").value;
        cardData.cardCode = document.getElementById("cardCode").value;

    // If using banking information instead of card information,
    // build a bankData object instead of a cardData object.
    //
    // var bankData = {};
    //     bankData.accountNumber = document.getElementById('accountNumber').value;
    //     bankData.routingNumber = document.getElementById('routingNumber').value;
    //     bankData.nameOnAccount = document.getElementById('nameOnAccount').value;
    //     bankData.accountType = document.getElementById('accountType').value;

    var secureData = {};
        secureData.authData = authData;
        secureData.cardData = cardData;
        // If using banking information instead of card information,
        // send the bankData object instead of the cardData object.
        //
        // secureData.bankData = bankData;

    Accept.dispatchData(secureData, responseHandler);

    function responseHandler(response) {
        if (response.messages.resultCode === "Error") {
            var i = 0;
            while (i < response.messages.message.length) {
                console.log(
                    response.messages.message[i].code + ": " +
                    response.messages.message[i].text
                );
                i = i + 1;
            }
        } else {
            paymentFormUpdate(response.opaqueData);
        }
    }
}

function paymentFormUpdate(opaqueData) {
    document.getElementById("dataDescriptor").value = opaqueData.dataDescriptor;
    document.getElementById("dataValue").value = opaqueData.dataValue;

    // If using your own form to collect the sensitive data from the customer,
    // blank out the fields before submitting them to your server.
    document.getElementById("cardNumber").value = "";
    document.getElementById("expMonth").value = "";
    document.getElementById("expYear").value = "";
    document.getElementById("cardCode").value = "";
    document.getElementById("accountNumber").value = "";
    document.getElementById("routingNumber").value = "";
    document.getElementById("nameOnAccount").value = "";
    document.getElementById("accountType").value = "";

    document.getElementById("paymentForm").submit();
}
</script>

</body>
</html>

PaymentProcess.aspx

Imports System
Imports System.Linq
Imports System.Text
Imports System.Threading.Tasks
Imports System.Collections.Generic
Imports AuthorizeNet.Api.Controllers
Imports AuthorizeNet.Api.Contracts.V1
Imports AuthorizeNet.Api.Controllers.Bases

Public Class PaymentProcess
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        'EMPTY!!!
        Dim infoValue = Request.Form("dataValue")
        Dim infoDescriptor = Request.Form("dataDescriptor")

        Run()
    End Sub

    Private Sub Run()
        ' Public Shared Function Run(ByVal ApiLoginID As String, ByVal ApiTransactionKey As String, ByVal amount As Decimal) As ANetApiResponse
        Console.WriteLine("Create an Accept Payment Transaction Sample")
        ApiOperationBase(Of ANetApiRequest, ANetApiResponse).RunEnvironment = AuthorizeNet.Environment.SANDBOX
        ApiOperationBase(Of ANetApiRequest, ANetApiResponse).MerchantAuthentication = New merchantAuthenticationType() With {
                .name = ConfigurationManager.AppSettings("AUTHORIZE_NET_API_LOGIN"),
                .ItemElementName = ItemChoiceType.transactionKey,
                .Item = ConfigurationManager.AppSettings("AUTHORIZE_NET_TRANSACTION_KEY")
            }
        Dim opaqueData = New opaqueDataType With {
                .dataDescriptor = "COMMON.ACCEPT.INAPP.PAYMENT",
                .dataValue = "119eyJjb2RlIjoiNTBfMl8wNjAwMDUyN0JEODE4RjQxOUEyRjhGQkIxMkY0MzdGQjAxQUIwRTY2NjhFNEFCN0VENzE4NTUwMjlGRUU0M0JFMENERUIwQzM2M0ExOUEwMDAzNzlGRDNFMjBCODJEMDFCQjkyNEJDIiwidG9rZW4iOiI5NDkwMjMyMTAyOTQwOTk5NDA0NjAzIiwidiI6IjEuMSJ9"
            }
        Dim billingAddress = New customerAddressType With {
            .firstName = "John",
            .lastName = "Doe",
            .address = "123 My St",
            .city = "OurTown",
            .zip = "98004"
        }
        Dim paymentType = New paymentType With {
            .Item = opaqueData
        }
        Dim lineItems = New lineItemType(1) {}
        lineItems(0) = New lineItemType With {
            .itemId = "1",
            .name = "t-shirt",
            .quantity = 2,
            .unitPrice = New Decimal(15.0)
        }
        lineItems(1) = New lineItemType With {
            .itemId = "2",
            .name = "snowboard",
            .quantity = 1,
            .unitPrice = New Decimal(450.0)
        }
        Dim transactionRequest = New transactionRequestType With {
            .transactionType = transactionTypeEnum.authCaptureTransaction.ToString(),
            .amount = "5.00",
            .payment = paymentType,
            .billTo = billingAddress,
            .lineItems = lineItems
        }
        Dim request = New createTransactionRequest With {
            .transactionRequest = transactionRequest
        }
        Dim controller = New createTransactionController(request)
        controller.Execute()
        Dim response = controller.GetApiResponse()

        If response IsNot Nothing Then

            If response.messages.resultCode = messageTypeEnum.Ok Then

                If response.transactionResponse.messages IsNot Nothing Then
                    Console.WriteLine("Successfully created transaction with Transaction ID: " & response.transactionResponse.transId)
                    Console.WriteLine("Response Code: " & response.transactionResponse.responseCode)
                    Console.WriteLine("Message Code: " & response.transactionResponse.messages(0).code)
                    Console.WriteLine("Description: " & response.transactionResponse.messages(0).description)
                    Console.WriteLine("Success, Auth Code : " & response.transactionResponse.authCode)
                Else
                    Console.WriteLine("Failed Transaction.")

                    If response.transactionResponse.errors IsNot Nothing Then
                        Console.WriteLine("Error Code: " & response.transactionResponse.errors(0).errorCode)
                        Console.WriteLine("Error message: " & response.transactionResponse.errors(0).errorText)
                    End If
                End If
            Else
                Console.WriteLine("Failed Transaction.")

                If response.transactionResponse IsNot Nothing AndAlso response.transactionResponse.errors IsNot Nothing Then
                    Console.WriteLine("Error Code: " & response.transactionResponse.errors(0).errorCode)
                    Console.WriteLine("Error message: " & response.transactionResponse.errors(0).errorText)
                Else
                    Console.WriteLine("Error Code: " & response.messages.message(0).code)
                    Console.WriteLine("Error message: " & response.messages.message(0).text)
                End If
            End If
        Else
            Console.WriteLine("Null Response.")
        End If
    End Sub
    '   Return response
    'End Function
End Class