ASP.NET submit post request with keys from code behind

Question

I am working on a page where we have a form that the user is filling some information in. When the form is submitted I want to process the information and then redirect to an external server. The catch is that I need post data to go to the external server so a redirect will not work.

Is there a way to programmatically submit a form request with post data?

For the sake of a ridiculous example let's say on http://A.com I have an asp.net page with two inputs that accept numbers and a submit button. When the button is clicked I want to send a post to http://B.com with a post data parameter "AdditionTotal" which contains the sum of the two numbers entered.

Answer 1

Absolutely, and it's very easy to do.

Normally a page posts back to itself, but you can override this by changing the "PostBackUrl" property of an ASP.NET button.

<asp:Button 
  ID="Button1" 
  PostBackUrl="http://B.com/AdditionTest.aspx"
  runat="server"
  Text="Submit" />