Help with HTTP POST VB.net/ASP.net

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Hi all,

I need to setup transactions between our customers and a bank for payments. The overall scheme is to have the customers click on a button on our site that will initiate the HTTP POST to the bank site. After the initial connection, there will be a response from the bank then a response from us, then finally the customer will be on the bank site to complete the transaction.

The initial connection is to mimic this example:

<form action="https://hostname/path" method="post">
<input type="hidden" name="app_id" value="0">
<input type="hidden" name="mess_ver" value="1.1">
</form>

So, my fist question is: how to I do the above in ASP.NET/VB?

Thank you in advance.

Posted 13-Aug-14 4:54am

Geof3

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PhilLenoir 13-Aug-14 11:10am

I don't understand the problem. That code should be just fine in an aspx. Does your question relate to using ASPX server controls instead of HTML ones?

Geof3 14-Aug-14 11:35am

The example I am giving is the html way...how would I go about doing the same thing in asp.net?

PhilLenoir 14-Aug-14 11:54am

If you create a blank ASPX page and replace the form tag and its contents with your HTML form it will work exactly the same. ASPX is contstructed from XHTML which is simply HTML with more tags. I assume that you must use the above field names for the bank? Do you want to get the values on your server side?

Geof3 14-Aug-14 12:46pm

The fields names are some of the names that must be used. Once the above code is run, there will be a response from the destination server, which I will then have to accept and respond to. Then their server will take over and process a payment and finally come back to our server. Its the transmission back and forth that I am getting confused with. The above code is the starting point from our end.

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PhilLenoir · Answer 1 · 2014-08-14T08:33:00

Solution 1

Create an ASPX page in a new web project and use this for the form code:

<form id="form1" action="https://hostname/path" method="post" runat="server">
<asp:hiddenfield id="hidApp_id" name="app_id" value="0" runat="server"/>
<asp:hiddenfield id="hidMess_ver" name="mess_ver" value="1.1" "runat="server" />
</form>

From your VB you can now:

hidApp_id.Value = x
hidMess_ver.Value= y

Posted 14-Aug-14 8:33am

PhilLenoir

Updated 14-Aug-14 8:38am

v3

Comments

Geof3 15-Aug-14 11:22am

Thank you for your suggestions....but how do I accept the responses from the bank side?

PhilLenoir 15-Aug-14 11:28am

Geoff, how do they reply to the request. My eCommerce provider uses an iFrame that contains a page that posts to them. They then redirect to a page I provide and I pick up their returned values there. Refer to your provider's documentation. Does the end user interact with this page? If not, another mechanism is to send the Post request using an HTTP object and receive the request directly (no browser).

Geof3 15-Aug-14 15:17pm

They are suppose to be posting to a page I provided - but after I initiate the session, that page is never accessed. This is the code I have as of now. I am posting to them their fields, but nothing happens after that.

Sub ConnectBankHTTP(url As String, postData As String)

Dim myWebRequest As HttpWebRequest = TryCast(WebRequest.Create(url), HttpWebRequest)
myWebRequest.Method = "POST"

Dim byteArray As Byte() = System.Text.Encoding.[Default].GetBytes(postData)
myWebRequest.ContentType = "application/x-www-form-urlencoded"
myWebRequest.ContentLength = byteArray.Length

Dim dataStream As System.IO.Stream = myWebRequest.GetRequestStream()
dataStream.Write(byteArray, 0, byteArray.Length)
dataStream.Close()

Dim myWebResponse As HttpWebResponse = CType(myWebRequest.GetResponse(), HttpWebResponse)
dataStream = myWebResponse.GetResponseStream()

Dim reader As New System.IO.StreamReader(dataStream)
Dim responseFromServer As String = reader.ReadToEnd()
Response.Write(responseFromServer + ":")
' TextBox1.Text = responseFromServer
'Response.Redirect(responseFromServer)
reader.Close()
dataStream.Close()
myWebResponse.Close()

End Sub

Geof3 15-Aug-14 15:37pm

I am getting something in return. If I display the value of responseFromServer, it is the HTML markup of an error page generated by the bank.

PhilLenoir 20-Aug-14 9:38am

I think that you are going to have to use their support function. You might try sending the request to a debugging page on your own server to examine the source that you are rendering. I would expect their error response to have some code/information returned explaining the error (that you might need to refer to their documentation to explain) They should also be logging the errors at their end, so they should be able to tell what the issue is.

Dattatray Gaonkar · Answer 2 · 2014-08-14T19:20:00

Solution 2

Use the server side control and use the value property to get the value from that control.

else you can use the sync java hit to using any other server side control like a asp:button and serve the same purpose.

Regards,
Dattatray Gaonkar

Posted 14-Aug-14 19:20pm

Dattatray Gaonkar

Comments

Geof3 15-Aug-14 11:22am

Thank you for your suggestions....but how do I accept the responses from the bank side?