Thanks. That looks like a nice routine, however, I need to "POST" and redirect to the page.

Here's how I've gotten this to work...........

Private Sub Post(ByVal paymentInfo As Payment)
    Dim HTML As StringBuilder = New StringBuilder

    HTML.Append("[html][head][title]Test[/title][/head][body]")
    HTML.Append(String.Format("[form name=""AutoForm"" method=""post"" action=""{0}""]", GatewayParameters.RequestURL))
    HTML.Append(String.Format("[input type=""hidden"" name=""TransactionAmount"" value=""{0}"" /]", paymentInfo.TransactionAmountAsString))
    HTML.Append(String.Format("[input type=""hidden"" name=""ECOMRequestID"" value=""{0}"" /]", GatewayParameters.ECOMRequestID))
    HTML.Append(String.Format("[input type=""hidden"" name=""PurchaseIdentifier1"" value=""{0}"" /]", paymentInfo.PurchaseIdentifier1))
    HTML.Append(String.Format("[input type=""hidden"" name=""PurchaseIdentifier2"" value=""{0}"" /]", paymentInfo.PurchaseIdentifier2))

    HTML.Append("[/form]")
    HTML.Append("[SCRIPT type=""text/javascript""]document.AutoForm.submit();[/SCRIPT]")
    HTML.Append("[/body][/html]")

    Response.Write(HTML.ToString)
End Sub

Note: < > replaced with [ ]

I've turned off the "Supports Partial Rendering"