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.: "Peter.Mustermann@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

Yijing Sun-MSFT 7,071

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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8 additional answers

Michael Taylor 48,826 Reputation points

2022-07-08T14:16:26.78+00:00
In general that isn't going to work properly. Cross page posting is an advanced use case. There are lots of things at play here but things that don't normally work right include anything stored in viewstate (because the new page doesn't have access to it). The recommended approach for cross page posting is to use the Page.PreviousPage property to get the previous page with all the controls (that were posted) filled in. You can read about it here. This helps resolve issues with viewstate I believe but honestly it has been a really long time since I've needed a cross page post.

//New page void HandlePost () { var page = PreviousPage as Registration; if (page != null) { //Get a value from the other page string txtOrt = page.txtOrt.Text; }; }
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Albert Kallal 4,806 Reputation points

2022-07-09T00:40:58.39+00:00
Ok, a lot of markup. The ONLY part we care is HOW we jump to the 2nd page.

If you use code behind for that button click - then previoius page is null and void.

So, say we have this markup - and good to see you used postbackURL.

So, assuming this markup:

WebFrom1.aspx

So, now on the target page, we want to get that value in txtName.

So, you MUST use the !IsPostBack event, and ONLY on first page load can you get previous values.

So, you have ONE try and grab at this.

So, the page load code on the 2nd target page, (WebForm2.aspx) can look like this:

markup:

And code behind can be this:

protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { // you MUST use the first page post-back - after that, previous page is null and void // get value of text box txtName TextBox txtName = Page.PreviousPage.FindControl("txtName") as TextBox; TextBox1.Text = txtName.Text; } }

So, as a general rule:

You have ONE try + grab - first page load ONLY - use !IsPostBack check as per above.

You can thus use find control for the previous page.

so, on first page, I have this:

We enter a value, click on button, and now on 2nd page, we get/see this;

Regards,
Albert D. Kallal (Access MVP 2003-2017)
Edmonton, Alberta Canada
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René 21 Reputation points

2022-07-09T08:43:40.78+00:00

Dear Albert Kallal and cooldadtx

Thanks for your examples

I'm used this code

The error in English
The object reference was not set to an object instance.

When I view the Previuspage object in the Object Explorer, the object is practically empty.
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René 21 Reputation points

2022-07-09T11:21:14.647+00:00

Dear all

I have used the following code.
This failure translated 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
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Albert Kallal 4,806 Reputation points

2022-07-09T15:10:41.233+00:00

what button was clicked on the previous page - how did it navigate to the current page?
as I stated, you HAVE to use a post-back URL in the button that jumps to the current page. If there is code behind for the button that jumps to the current page, then it cannot use Response.Redirect("to this current page.aspx"), as that will NOT work.

So, the code in your target page looks fine, but the question to answer is how/when and what button click and code was USED to navigate to the current page is the big question here.

As a test, make page called WebForm1, and WebForm2 as I did. Try the sample code. Does it work? (simple yes/no???).

Then if that example works, then drop a test button on your current page - linkbutton, or even standard asp.net button - but it WILL have to use PostBackURL. If you use anything else then postbackURL to get to the current page, then page.Previous will be NULL and void - and NOT work.

So, try two test pages as I show - does that work?

Edit:
In your posted example, you have a button called cmdBestellen - that does have a post-back url. But, does that button have any code behind? Does that button have it on Response.Redirect? (it should not).

So, does the button click (code behind) do any navigation? You can have a code behind (event stub) for that button click, but you HAVE to let the postbackURL of that button do the navigation - not code behind.

So, if page.previous is null and empty, then some other code MUST be running for that button click - does that button have code behind?
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