How to POST a FORM from HTML to ASPX page

How do I post a form from an HTML page to and ASPX page (2.0) and be able to read the values?

I currently have an ASP.NET site using the Membership provider and everything is working fine. Users can log in from the Login.aspx page.

We now want to be able to have users log in directly from another web site--which is basically a static HTML page. The users need to be able to enter their name and password on this HTML page and have it POST to my Login.aspx page (where I can then log them in manually).

Is it possible to pass form values from HTML to ASPX? I have tried everything and the Request.Form.Keys collection is always empty. I can't use a HTTP GET as these are credentials and can't be passed on a query string.

The only way I know of is an iframe.

From stackoverflow $pageUsers[$entry.posts[0].author].name

• Are you sure your HTML form is correct, and does, in fact, do an HTTP POST? I would suggest running Fiddler2, and then trying to log in via your Login.aspx, then the remote HTML site, and then comparing the requests that are sent to the server. For me, ASP.Net always worked fine -- if HTTP request contains a valid POST, I can get to values using Request.Form...

  From

• This is very possible. I mocked up 3 pages which should give you a proof of concept:

  .aspx page:

  <form id="form1" runat="server">
      <div>
          <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
          <asp:TextBox TextMode="password" ID="TextBox2" runat="server"></asp:TextBox>
          <asp:Button ID="Button1" runat="server" Text="Button" />
      </div>
  </form>
  

  code behind:

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
      For Each s As String In Request.Form.AllKeys
          Response.Write(s & ": " & Request.Form(s) & "<br />")
      Next
  End Sub
  

  Separate HTML page:

  <form action="http://localhost/MyTestApp/Default.aspx" method="post">
      <input name="TextBox1" type="text" value="" id="TextBox1" />
      <input name="TextBox2" type="password" id="TextBox2" />
      <input type="submit" name="Button1" value="Button" id="Button1" />
  </form>
  

  ...and it regurgitates the form values as expected. If this isn't working, as others suggested, use a traffic analysis tool (fiddler, ethereal), because something probably isn't going where you're expecting.

  From Pseudo Masochist

• You sure can.

  The easiest way to see how you might do this is to browse to the aspx page you want to post to. Then save the source of that page as HTML. Change the action of the form on your new html page to point back to the aspx page you originally copied it from.

  Add value tags to your form fields and put the data you want in there, then open the page and hit the submit button.

  From Flory

• You sure can. Create an HTML page with the form in it that will contain the necessary components from the login.aspx page (i.e. username, etc), and make sure they have the same IDs. For you action, make sure it's a post.

  You might have to do some code on the login.aspx page in the Page_Load function to read the form (in the Request.Form object) and call the appropriate functions to log the user in, but other than that, you should have access to the form, and can do what you want with it.

  From mjmcinto

• Isn't this the type of thing Jeff warned about in his article on CSRF and XSRF attacks?

  http://www.codinghorror.com/blog/archives/001175.html

  From Micky McQuade

• The Request.Form.Keys collection will be empty if none of your html inputs have NAMEs. It's easy to forget to put them there after you've been doing .NET for a while. Just name them and you'll be good to go.

  Anthony : It took me ages to realise that. When you do it in .Net, the asp.net engine automatically adds the name atttribute. If you create your html form 'by hand' it's very easy to forget it and then nothing gets posted and you wonder why.
  From Chris

• Dear Fellows, It is true that we can post form controls and can receive at aspx page as mentioned already. I have also a problem that is different from it. Question is How we can use html file upload control i.e. to get the file information and post to aspx page for further processing i.e. saving at server etc. ? I mean can we use file upload control in html page and how to get its value/data in aspx page ? Thanks in advance. Regards, Absials

  From Absials