This is probably a simple question but I have spent the last 2 hours on it and keep going down blind alleys.

I have an existing asp.net app which I wrote 2 years ago and I now need to add a page containing a form that invokes an external application using https. In my initial testing I got the basics to work using the following (slightly simplified ) code:

<form name="moduleForm" action="https://www.securesite..."
method="post" enctype="multipart/form-data" target="_blank" >
<input type="hidden" name="username" value="P128">
<input type="hidden" name="password" value="xxx">
<input type="image" src="../Statements.gif" hspace="5" name="memberstatements" />
</form>

I now need to dynamically update the hidden variable "username" with the actual username, which I have stored in a Session variable. I've tried several things, converting the form to runat=server and creating a Page_Load, etc. but the code is getting messier and I keep bumping into gotchas. The latest is that forms post unto themselves (didn't remember that). There must be a simple way to update this one variable and then let the user click on the button to submit the form.

(Sorry but my brain is in Coldfusion mode and I just can't get it back to .Net!!)

Have you considered using an HiddenField server control then doing a crosspost?

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That's probably part of a solution that would work. But my understanding is that if I use any input control that is marked runat="server", then I must also do the same with the form. And then it will always postback to itself. So then I assume I'll have to write some routine (perhaps an onclick) to actually call the new application. Feels like a lot of extra work to me.

For what it's worth I reverted to old ASP here and inserted the following into the page code right in the middle of the form. It took me one line and it worked:

<%
Response.Write( "<input type='hidden' name='username' value='" & Session("Account") & "'>" )
%>

Server forms do not have to post back to themselves. They can post to any form you want. That's what I meant by doing a crosspost.

Anyway, you got it working, so that's all that matters I guess.

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