Best way to create and post a form in codebehind in C#

Question

I'm using webforms and I need to create and POST an http form to a payment gateway for one of my clients. I'm using a user control that is displayed in a masterpage, however they already have an existing <form> on the page, so I'm pretty sure I cannot add another.

What is the best practice method to create and post a form in C# from the code behind? Currently I have the following:

var nvc = new System.Collections.Specialized.NameValueCollection
    {
        {"EWAY_ACCESSCODE", ewayResponse.AccessCode},
        {"EWAY_CARDNAME", txtCcName.Text},
        {"EWAY_CARDNUMBER", txtCcNumber.Text},
        {"EWAY_CARDEXPIRYMONTH", ddlCcExpMonth.SelectedValue},
        {"EWAY_CARDEXPIRYYEAR", ddlCcExpYear.SelectedValue},
        {"EWAY_CARDCVN", txtCcv.Text}
    };

    var client = new WebClient();
    client.UploadValues(ewayResponse.FormActionURL, nvc);

This does work, but is there a better / alternative way to do it?

cooooooooooooooo, this might give some insight: stackoverflow.com/questions/5401501/… — Stephen
– Stephen, Commented Nov 11, 2013 at 2:32

EdSF · Accepted Answer · 2013-11-11 03:16:54Z

4

Aside from the previous suggestion:

why wouldn't a (simpler) Button.PostbackUrl work?

<asp:Button ID="externalPost" runat="server" PostBackUrl="http://www.somewhere.com/" Text="Post Somewhere" />

Also, assuming that's a payment gateway you're referring to, you're doing a server-side POST, which has implications on PCI Compliance (vs. a direct form post from client/browser).

Hth.

answered Nov 11, 2013 at 3:16

EdSF

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3 Comments

Alex Over a year ago

I agree with the PCI stuff, that's why I'd like to do find a better solution. So the best option would be IrishChieftain's solution? Or is there a more elegant way to do it?

EdSF Over a year ago

@AlexFrame As above, any reason why Button.PostBackUrl wouldn't work? What it will do is actually do a direct post to the url you set, resolving the PCI matter. I haven't tried the suggestion below, but a quick read of the code allows you to remove the server-side <form/> tag. Of course, that would also mean that some other code maybe affected (e.g. other controls on page that rely on default Postback behavior), which you will then need to adjust.

IrishChieftain Over a year ago

It "toggles" the form tag so no other controls are affected. I used it in five different E-Commerce sites I have developed. You can use JavaScript presuming it's enabled on all clients. Only other solution is to add a second pair of form tags and that's a hack that nobody has yet explained ;-)

IrishChieftain · Accepted Answer · 2013-11-11 01:19:10Z

1

Here is the solution I use:

http://jerschneid.blogspot.com/2007/03/hide-form-tag-but-leave-content.html

Caveat (own blog post):

http://codersbarn.com/post/2008/03/08/Solution-to-ASPNET-Form-PayPal-Problem.aspx

answered Nov 11, 2013 at 1:19

IrishChieftain

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