Why is my Asp.Net Form arriving empty when I post from Page to Page?

Question

I have the following HTML Code

<%@ Page Language="C#" %>

<html>
    <head>
        <title></title>
    </head>
    <body>
        <form id="frmSystem" method="post" action="target.aspx">
            <input id="txtTextField" type="text" />
            <input id="btnPost" value="Submit" onclick="javascript:frmSystem.submit();" type="button" />
        </form>
    </body>
</html>

The target Page is coming up but the form that it is receiving is empty. I have a break point on my target.aspx page and while I can see a form, it's keys are empty and Request["txtTextField"] gives me nothing.

Any clue why?

What does your target form code look like? where is your breakpoint? — Matt Lacey, Mar 12 '10 at 15:19
For now all I have in my target is this <%@ Page Language="C#" %> <% string text = ""; %> and I'm obviously breaking on the only line of code. I use Watches to verify what I'm getting. — William Calleja, Mar 12 '10 at 15:34

score 5 · Accepted Answer · answered Mar 12 '10 at 15:18

5

If you are using ASP.NET MVC, the input names need to be set with the "name" attribute rather than "id".

answered Mar 12 '10 at 15:18

Swoop

1,423
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I'm using webforms. No code behind, just a dll to handle some database access and the rest is scripts. – William Calleja Mar 12 '10 at 15:35
Thanks a lot actually, that was the solution. – William Calleja Mar 12 '10 at 15:52
You can use the `name` rather than `id` attribute as well as in the Asp.net web application or `webforms` too. – Reza Paidar Jan 04 '20 at 12:42

score 2 · Answer 2 · answered Jun 04 '13 at 10:41

2

You probably reset the form value in event handlers (such as page_load).

answered Jun 04 '13 at 10:41

manofseven2

51
4

I usually blame users for stupid conducts, now the stupid was me. Thanks @manofseven2 – rasputino Oct 01 '19 at 08:06

score 1 · Answer 3 · edited May 23 '17 at 12:24

1

If you are using ASP.NET 4.5 like me, use below hints

Disable auto Friendly URLs in a Web Form project
- settings.AutoRedirectMode = RedirectMode.Off; // in RouteConfig.cs
if you can:
- remove action="CILandingPage.aspx" from form element
- put a asp:button instead of normal button
- set PostBackUrl="~/CILandingPage.aspx" on your asp:button

more resources with more detail that was useful to me

edited May 23 '17 at 12:24

Community

1
1

answered Nov 17 '16 at 08:40

Iman

17,932
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Importantly noted in your first link, you can set settings.AutoRedirectMode = RedirectMode.Off inside RouteConfig.cs . It is not necessary to disable auto friendly URLs entirely. – Craig Mason Jan 18 '17 at 21:24

score 0 · Answer 4 · answered Jan 18 '17 at 21:31

Another option is to capture your Request.Form[] data in Application_BeginRequest on the Global.asax.cs:

protected void Application_BeginRequest(object sender, EventArgs e)
{
    //capture form data and preserve in query string
    if (Request.Form["txtTextField"]!= null)
    {
        Response.Redirect(Request.RawUrl + "?txtTextField=" 
          + Request.Form["txtTextField"]);
    }
    //or preserve in Session variable
    if(Request.Form["txtTextField"]!=null)
    {
        Session["txtTextField"]=Request.Form["txtTextField"];
    }
}

The problem is that the form data is lost on the automatic redirect which is applied by friendlyUrls - if you store that data as something other than form data, it is unnecessary to turn off friendlyUrls or set AutoRedirectMode to RedirectMode.Off.

Why is my Asp.Net Form arriving empty when I post from Page to Page?

4 Answers4

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