My ASP.Net Page doesn't post form data to another second page

Question

My ASP.Net Page doesn't post form data to another second page

René 21

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Registration.aspx.vb" Inherits="Test.Registration" %>  
  
<!DOCTYPE html>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head runat="server">  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>  
    <title></title>  
  
  <!-- Google Fonts -->  
  <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,300i,400,400i,600,600i,700,700i|Roboto:300,300i,400,400i,500,500i,600,600i,700,700i|Poppins:300,300i,400,400i,500,500i,600,600i,700,700i" rel="stylesheet">  
  
  <!-- Vendor CSS Files -->  
  <link href="assets/vendor/aos/aos.css" rel="stylesheet" />  
  <link href="assets/vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet" />  
  <link href="assets/vendor/bootstrap-icons/bootstrap-icons.css" rel="stylesheet" />  
  <link href="assets/vendor/boxicons/css/boxicons.min.css" rel="stylesheet" />  
  <link href="assets/vendor/glightbox/css/glightbox.min.css" rel="stylesheet" />  
  <link href="assets/vendor/swiper/swiper-bundle.min.css" rel="stylesheet" />  
  
  <!-- Template Main CSS File -->  
  <link href="assets/css/style.css" rel="stylesheet" />  
                            <script>  
                                function check() {  
                                    //For dem Absenden des Formulars sollen einige Variablen  
                                    //überprüft werden.  
                                    //Zuerst herausfinden, ob ein Textfeld leer ist.  
                                    var x;  
                                    x = 0;  
                                    var f = document.getElementById("frmRegistration")  
                                    for (x; x < f.length; x++) {  
                                        if (f[x].name == 'txtAnzahlLizenzen') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie die Anzahl Lizenzen an.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'cmbEdition') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie die gewünschte Edition an.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'txtAnzahlLizenzen') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie die gewünschte Anzahl Lizenzen an.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'txtVorname') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie Ihren Vornamen ein.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'txtNachname') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie Ihren Nachnamen ein.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'txtStrasse') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie Ihre Strasse ein.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'txtPLZ') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie die PLZ ein.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'txtOrt') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie Ihren Ort ein.');  
                                                return (false);  
                                            }  
                                        }  
  
                                        if (f[x].name == 'txtMail') {  
                                            if (f[x].value == '') {  
                                                alert('Bitte geben Sie Ihre Mailaadresse ein.');  
                                                return (false);  
                                            }  
                                            //Jetzt wird die EMail-Adresse nach Leerzeichen durchsucht.  
                                            //-1 bedeutet, dass kein Leerzeichen gefunden wurde.  
                                            if (f[x].value.search(/ /) != '-1') {  
                                                alert('Die E-Mail Adresse darf keine Leerzeichen enthalten!');  
                                                return (false);  
                                            }  
                                            //Am Schluss soll noch einmal das Format ueberprüft werden.  
                                            s = f[x].value.split(/@/);  
                                            if ((s.length != 2) || s[0] == '' || s[1] == '') {  
                                                alert('E-Mail Adressen haben das Format "Benutzer@Domain",\n'  
                                                    + 'z.B.: "******@provider.ch"');  
                                                return (false);  
                                            }  
                                        }  
                                    }  
                                }  
                            </script>  
</head>  
<body>  
    <form id="frmRegistration" runat="server" method="post" enctype="multipart/form-data" onsubmit="return check();">  
        <main id="main">  
            <!-- ======= News Section ======= -->  
            <section id="programmdetails" class="news section-bg">   
              <div class="container" data-aos="fade-up">  
  
                    <div class="section-title">   
                        <h3>PW-Soft, die ultimative Fahrzeugverwaltung <br /><span>Registrierung- und Lizenzierung</span></h3>  
                        <p>   
                        Bitte tragen Sie Ihre Daten mindestens in den mit Sternchen markierten Pflichtfelder ein, damit wir Ihre Bestellung bearbeiten können.  
                        </p>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                     <div class="col-lg-6 col-md-5">  
                                <asp:Label ID="lblKey" runat="server" Text="Registrations-Schlüssel"></asp:Label>  
                        </div>  
                        <div class="col-lg-5 col-md-5">  
                                <asp:TextBox ID="txtKey" Enabled="false" runat="server"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblVersion" runat="server" Text="Version" style="margin-right:10px;"></asp:Label>  
                        </div>  
                        <div class="col-lg-2 col-md-2">  
                            <asp:TextBox ID="txtVersion" Enabled="true" runat="server" Width="100px"></asp:TextBox>  
                        </div>  
                        <div class="col-lg-2 col-md-2">  
                            <asp:Label ID="lblEdition" runat="server" Text="Edition" style="margin-right:10px;"></asp:Label>  
                            <asp:Label ID="lblRequired1" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-2 col-md-2">  
                            <asp:DropDownList ID="cmbEdition" runat="server">  
                                <asp:ListItem Selected="True"></asp:ListItem>  
                                <asp:ListItem Value="Standard"></asp:ListItem>  
                                <asp:ListItem Value="Professional"></asp:ListItem>  
                                <asp:ListItem Value="Enterprise"></asp:ListItem>  
                                <asp:ListItem Value="Full"></asp:ListItem>  
                            </asp:DropDownList>  
  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblAnzLizenzen" runat="server" Text="Anzahl Lizenzen"></asp:Label>  
                            <asp:Label ID="lblRequired2" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:TextBox ID="txtAnzahlLizenzen" Enabled="true" runat="server" Width="50px"></asp:TextBox>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblUpgradeVon" runat="server" Text="Upgrade von" style="margin-right:10px;"></asp:Label>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:TextBox ID="txtUpgradeVon" Enabled="true" runat="server" Width="100px"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblGutscheincode" runat="server" Text="Gutscheincode" style="margin-right:10px;"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                            <asp:TextBox ID="txtGutscheincode" Enabled="true" runat="server" Width="150px"></asp:TextBox>  
                        </div>  
                    </div>  
              </div>  
            </section>               
              
            <!-- ======= News Section ======= -->  
            <section id="Userdaten" class="news section-bg">   
                <div class="container" data-aos="fade-up">  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblFirma" runat="server" Text="Firma"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                            <asp:TextBox ID="txtFirma" Enabled="true" runat="server" Width="250px"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblAnrede" runat="server" Text="Anrede"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                            <asp:DropDownList ID="cmbAnrede" runat="server">  
                                <asp:ListItem Selected="True"></asp:ListItem>  
                                <asp:ListItem Value="Herr"></asp:ListItem>  
                                <asp:ListItem Value="Frau"></asp:ListItem>  
                                <asp:ListItem Value="Firma"></asp:ListItem>  
                            </asp:DropDownList>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblVorname" runat="server" Text="Vorname"></asp:Label>  
                            <asp:Label ID="lblRequired3" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                            <asp:TextBox ID="txtVorname" Enabled="true" runat="server" Width="150px"></asp:TextBox>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblNachname" runat="server" Text="Nachname"></asp:Label>  
                            <asp:Label ID="lblRequired4" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:TextBox ID="txtNachname" Enabled="true" runat="server" Width="150px"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblStrasse" runat="server" Text="Strasse"></asp:Label>  
                            <asp:Label ID="lblRequired5" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:TextBox ID="txtStrasse" Enabled="true" runat="server" Width="350px"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblPLZ" runat="server" Text="PLZ"></asp:Label>  
                            <asp:Label ID="lblRequired6" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                            <asp:TextBox ID="txtPLZ" Enabled="true" runat="server" Width="70px"></asp:TextBox>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblOrt" runat="server" Text="Ort"></asp:Label>  
                             <asp:Label ID="lblRequired7" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:TextBox ID="txtOrt" Enabled="true" runat="server" Width="250px"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblLand" runat="server" Text="Land"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                                <asp:DropDownList ID="cmbLand" runat="server">  
                                <asp:ListItem Selected="True"></asp:ListItem>  
                                <asp:ListItem Value="Schweiz"></asp:ListItem>  
                                <asp:ListItem Value="Deutschland"></asp:ListItem>  
                                <asp:ListItem Value="Österreich"></asp:ListItem>  
                                <asp:ListItem Value="Frankreich"></asp:ListItem>  
                                <asp:ListItem Value="Belgien"></asp:ListItem>  
                                <asp:ListItem Value="Niederlande"></asp:ListItem>  
                                <asp:ListItem Value="Dänemark"></asp:ListItem>  
                                <asp:ListItem Value="Schweden"></asp:ListItem>  
                                <asp:ListItem Value="Norwegen"></asp:ListItem>  
                            </asp:DropDownList>  
                        </div>  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblTelefon" runat="server" Text="Telefon"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                            <asp:TextBox ID="txtTelefon" Enabled="true" runat="server" Width="150px"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblMail" runat="server" Text="E-Mail"></asp:Label>  
                            <asp:Label ID="lblRequired8" runat="server" Text="*" style="color:red;"></asp:Label>  
                        </div>  
                        <div class="col-lg-3 col-md-5">  
                            <asp:TextBox ID="txtMail" Enabled="true" runat="server" Width="350px"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
                            <asp:Label ID="lblKommentar" runat="server" Text="Kommentar"></asp:Label>  
                        </div>  
  
                        <div class="col-lg-2 col-md-5">  
                            <asp:TextBox ID="txtKommentar" Enabled="true" runat="server" Width="350px" TextMode="MultiLine" Rows="10" style="min-height:100px;"></asp:TextBox>  
                        </div>  
                    </div>  
                    <div class="row" style="margin-bottom:20px;">  
                        <div class="col-lg-2 col-md-5">  
  
                            <asp:Button ID="cmdBestellen" runat="server" Text="Bestellung speichern" PostBackUrl="Zahlung.aspx" />  
  
                        </div>  
                    </div>  
                </div>  
            </section>  
        </main>  
    </form>  
      <!-- Vendor JS Files -->  
  <script src="assets/vendor/aos/aos.js"></script>  
  <script src="assets/vendor/bootstrap/js/bootstrap.bundle.min.js"></script>  
  <script src="assets/vendor/glightbox/js/glightbox.min.js"></script>  
  <script src="assets/vendor/isotope-layout/isotope.pkgd.min.js"></script>  
  <script src="assets/vendor/purecounter/purecounter.js"></script>  
  <script src="assets/vendor/swiper/swiper-bundle.min.js"></script>  
  <script src="assets/vendor/waypoints/noframework.waypoints.js"></script>  
  
  <!-- Template Main JS File -->  
  <script src="assets/js/main.js"></script>  
  <script src="assets/js/jquery.min.js"></script>  
</body>  
</html>

The Page is under this URL avalaible
Registration.aspx

The CodeBehind Code from the second page fires, but have nothing in the Response.Form Object.

Public Class Zahlung
Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load  
    Dim Key As String = Request.Form("txtKey")  
    Response.Write(Key)  
End Sub

End Class

Whats the problem of postbackurl with some CSS Styesheets? In Zahlung.aspx there is nothing in the Request.Form.

Thanks a lot for your help or any suggestions

Greetings René

René 21 Reputation points

2022-07-09T08:58:02.783+00:00

Dear all

The code works great on Windows Server with IIS 8.0.

However, it does not work in Visual Studio. Are there any settings in Visual Studio on the local IIS?

Thank you very much for your advice.

Greetings, René
René 21 Reputation points

2022-07-09T11:18:42.117+00:00

Dear all

I have used the following code.
This failure translanted to english
The object reference was not set to an object instance

How can it be achieved that the Form Object has content?
Thanks for sugestions
René

Accepted answer

8 additional answers

Your answer

René 21 Reputation points

2022-07-09T08:58:02.783+00:00

Dear all

The code works great on Windows Server with IIS 8.0.

However, it does not work in Visual Studio. Are there any settings in Visual Studio on the local IIS?

Thank you very much for your advice.

Greetings, René
René 21 Reputation points

2022-07-09T11:18:42.117+00:00

Dear all

I have used the following code.
This failure translanted to english
The object reference was not set to an object instance

How can it be achieved that the Form Object has content?
Thanks for sugestions
René

Answer 1

Hi @René ,
You find the actual path when you are using friendly url. So, I suggest you could use Server.Transfer. You could try to test use this demo.

Page1,named Test2:

            <asp:Label ID="Label1" runat="server" Text="Company Name"></asp:Label>  
            <asp:TextBox ID="txtkey" runat="server"></asp:TextBox>  
            <asp:Button ID="cmdspichern" runat="server" Text="spichern" O nClick="cmdspichern_Click" />

Code-behind:

 Protected Sub cmdspichern_C lick(sender As Object, e As EventArgs)  
        S erver.Transfer("~/Test3.aspx")  
    End Sub

Page2,named Test3:

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

Code-behind:

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load  
        If Not IsPostBack Then  
            Dim txtBoxtest As TextBox = CType(Page.PreviousPage.FindControl("txtKey"), TextBox)  
            TextBox1.Text = txtBoxtest.Text  
        End If  
    End Sub

You could check the microsoft article.

Best regards,
Yijing Sun

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Answer 2

Dear Albert, thanks a lot for your time and support.

I defined a testpage named test2.aspx as first page This is the code

<!DOCTYPE html> <html> <head> <title>Customer Form</title> </head> <body> <form method="post" runat="server" > <fieldset> <legend>Add Customer</legend> <div> <label for="CompanyName">key:</label> <input type="text" name="txtkey" value="" /> </div> <div> <label> </label> <asp:Button ID="cmdSpeichern" runat="server" Text="Speichern" PostBackUrl="Test3.aspx" /> </div> </fieldset> </form> </body> </html>

You can access the first page online on this url. http://www.centil-europe.ch/Registration/test2.aspx

This is the code from the second page named test3.aspx <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Test3.aspx.vb" Inherits="Test.Test3" %>

<!DOCTYPE html>

And this is the codebehind

No, the button in the first page has no code behind it. There is only the PostBackURL in the button html-code.

Greetings René

Albert Kallal 5,586 Reputation points

2022-07-09T18:54:25.483+00:00

Why are you now out of the blue introducing a standard HTML input? Lets not do and mess with such a big change. Try to get the simple sample working - see my new post below.

I suggest for learning, and first try try to stick to using standard asp.net controls. Then over time, you can start to mess with, and play with introduction of say a html "input", but for this testing and learning? - not required.

Answer 3

A few things:

First up, your sample page is 100% different, and does NOT EVEN use a standard control, and does not even have a "id" for the control we are trying to use?

Also, WHY are you messing around with the default and basic template that is created by default? (that explains MUCH of your issues and problem here).

So, lets create a new page Test2.aspx.

Let the designer create that default markup for you (don't mess around with that!!!!). And why are you messing around with the default form div created for you? (again, no need to mess with that)

Worse yet? In your original markup, you using a standard asp.net text box, NOW FOR SOME AMAZING reason, you are dropping in a html "input" control, and EVEN WORSE yet, you are NOT even giving that control a "id", but out of the blue all of a sudden using name? (why are you doing this?????).

So, lets try this again:

So, we create that new page, leave the default markup alone - use that default markup.

So, we now have this in Test2

so, really, the ONLY part you mess with is the new markup we placed inside of the default "div", as per above. As noted, use the standard asp.net controls, make sure they have a "id". In fact, just use drag + drop from the tool box - that way you have a hard time to mess this up.

So, we have above.

Now, for 2nd page? Lets just drag from toolbox in a text box. We have this:

Again, no need to mess with the "form" and the automatic default layout - just use that.

Now, our code behind, can be this:

Public Class Test3  
    Inherits System.Web.UI.Page  
  
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load  
  
        If Not IsPostBack Then  
  
            Dim txtBoxtest As TextBox = Page.PreviousPage.FindControl("txtKey")  
            TextBox1.Text = txtBoxtest.Text  
  
        End If  
    End Sub

So, now lets try this:

We click button, 2nd page loads, and we see/have this:

As noted, for this simple test, I don't out of the blue would suggest you test using a html "input" control, and in fact your original markup used a standard plane jane asp.net text box (it should work).

So, get this sample working. Then we can re-visit your original posted markup. but, looking at your first sample page, it should work. but, get the sample working.

Then perhaps create a new test page - put in your markup by bits and parts (don't mess with the form "id" - no need to. So, just paste inside of the default "form" tag that the designer creates for you by default.

Answer 4

Dear Albert

Yes that's right, I had tried different things.
Now I have deleted the Test2.aspx page and created it again. Added label, text field and button.

However, PreviousPage is always nothing.in page test3.aspx

Here is the new code of Test2.aspx

<%@ Page Language="vb" AutoEventWireup="true" CodeBehind="Test2.aspx.vb" Inherits="Test.Test2" %>

<!DOCTYPE html>

Basically, it does not matter which parameters are used, the error is always that PreviusPage is nothing.

Not even in the own page Test2 it is possible to read and save the posted values. Not even with standard page and controls.

It seems like there is basically something missing in the development environment that would also need to be published for this to work properly on the web server. On the code side, I have tried everything imaginable.

Greetings René

Answer 5

René 21

Dear Albert

I updated Visual Studio 2019 with the latest version last night. The test pages are now working on the web server. In the LocalHost still comes the same error. This is not so tragic, I can test on the web server too, but is not so comfortable.
Thanks for the help. And sorry for posting the wrong HTML code. As for the LocalHost, that could be an OS issue, which is still Windows 7 Professional. However, Visual Studio had no problem during the installation and yes installs the LocalHost during the installation process as well. Difficult to estimate what is the problem in the localhost. Do you possibly or any of the readers have an idea?

Thanks for the inputs and examples.
Greetings, René

Albert Kallal 5,586 Reputation points

2022-07-10T15:43:39.28+00:00

No worries. The key concept here is to try as "simple as possible". So, we in a sense have the most bare bones test + setup. Then when we verify that works, then we can start introduction of additonal JavaScript's, and library code - and see when it breaks.

My sample code - I'm using vs2019. And it works fine as when developing local, or on a real web server.

it should work - and does work for me using F5 in visual studio to run on the local "built in" IIS express version.

I would create a new project. I assume this is a asp.net webforms applcation, and not a asp.net weforms site (there are two choices - both should work). But, you could try create a fresh new project - see if that works, say this one:

So, this should work for you on your dev box - it does for me.
Albert Kallal 5,586 Reputation points

2022-07-10T16:11:53.93+00:00

Often, post-back URL is too limited. I prefer to use sesssion() to pass a few values.

So, say this first page:

We double click on the button to wire up a click event, say with this:

And now in the target page, we go:

So, post-back URL is quite limited, since I don't get a easy to use button click, and code to run. So, often, if you need to pass just 1 or say 3 values, then consider using session(), since then we don't have to use post-back URL.

However, my examples do work during local development. It not quite clear what web config, or changes you made, but I would consider creating a blank new "empty" web application, and see if page.previous works for you - it should.

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My ASP.Net Page doesn't post form data to another second page

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