Re: [DUG] display value of form1.txtbox in form2.txtbox

Tracey Maule Mon, 02 Feb 2004 16:03:34 -0800

ok, I got as far as showing stuff in one page, but now pass the content of the asp:textbox to Webform2.aspx and display it in a text box

It was when i added page2 that i struck problems

I can display request.querystring.get('stringname') in the body, but not a txtbox.

I get this error now (note that deleting my web control and adding a new one gives me now no complile errors but this runtime error - hmmmm)

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 55:   response.Write(request.QueryString.Get('txtpass'));  
Line 57:   txtWeb.Text := request.QueryString.Get('txtpass').ToString;

Source File: c:\inetpub\wwwroot\WebApplication3\WebForm2.pas Line: 57

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   WebForm2.TWebForm2.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\WebApplication3\WebForm2.pas:57
   System.Web.UI.Control.OnLoad(EventArgs e) +67
   System.Web.UI.Control.LoadRecursive() +35
   System.Web.UI.Page.ProcessRequestMain() +731

i even tried adding this code to no avail (after advise from M$.NET guru):

procedure TWebForm2.Page_Load(sender: System.Object; e: System.EventArgs);
var
   txtWeb : System.Web.UI.WebControls.TextBox;
begin
    txtWeb := System.Web.UI.WebControls.TextBox.Create;
   txtWeb.Text := request.QueryString.Get('txtpass').ToString;
end;

still the same erorr

----- Original Message -----

From: James Sugrue

To: 'NZ Borland Developers Group - Delphi List'

Sent: Tuesday, February 03, 2004 10:56 AM

Subject: RE: [DUG] display value of form1.txtbox in form2.txtbox

Tracey how about this:

---------------------------- Webform1.aspx ----------------------------------------------------------------------

<%@ Page language="c#" Debug="true" Codebehind="WebForm1.pas" AutoEventWireup="false" Inherits="WebForm1.TWebForm1" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html>

<head>

</head>

<asp:button id=Button1

style="Z-INDEX: 1; LEFT: 46px; POSITION: absolute; TOP: 134px"

runat="server" width="83px" height="23" text="Submit">

</asp:button>

<asp:textbox id=txtUserName

style="Z-INDEX: 2; LEFT: 102px; POSITION: absolute; TOP: 38px"

runat="server">

</asp:textbox>

<asp:textbox id=txtPassword

style="Z-INDEX: 3; LEFT: 102px; POSITION: absolute; TOP: 62px"

runat="server" textmode="Password">

</asp:textbox>

<asp:label id=Label1

style="Z-INDEX: 6; LEFT: 22px; POSITION: absolute; TOP: 38px"

runat="server" font-size="X-Small" font-names="Arial">Username</asp:label>

<asp:label id=Label2

style="Z-INDEX: 7; LEFT: 22px; POSITION: absolute; TOP: 62px"

runat="server" font-size="X-Small" font-names="Arial">Password</asp:label>

<asp:label id=Label3

style="Z-INDEX: 8; LEFT: 334px; POSITION: absolute; TOP: 102px"

runat="server">Label</asp:label>

</form>

</body>

</html>

--------------------------------------------------------- WEBFORM1.PAS --------------------------------------------------------------

unit WebForm1;

interface

uses

System.Collections, System.ComponentModel,

System.Data, System.Drawing, System.Web, System.Web.SessionState,

System.Web.UI, System.Web.UI.WebControls, System.Web.UI.HtmlControls;

type

TWebForm1 = class(System.Web.UI.Page)

{$REGION 'Designer Managed Code'}

strict private

procedure InitializeComponent;

procedure Button1_Click(sender: System.Object; e: System.EventArgs);

{$ENDREGION}

strict private

procedure Page_Load(sender: System.Object; e: System.EventArgs);

strict protected

Button1: System.Web.UI.WebControls.Button;

txtUserName: System.Web.UI.WebControls.TextBox;

txtPassword: System.Web.UI.WebControls.TextBox;

Label1: System.Web.UI.WebControls.Label;

Label2: System.Web.UI.WebControls.Label;

Label3: System.Web.UI.WebControls.Label;

procedure OnInit(e: EventArgs); override;

private

{ Private Declarations }

public

{ Public Declarations }

end;

implementation

{$REGION 'Designer Managed Code'}

/// <summary>

/// Required method for Designer support -- do not modify

/// the contents of this method with the code editor.

/// </summary>

procedure TWebForm1.InitializeComponent;

begin

Include(Self.Button1.Click, Self.Button1_Click);

Include(Self.Load, Self.Page_Load);

end;

{$ENDREGION}

procedure TWebForm1.Page_Load(sender: System.Object; e: System.EventArgs);

begin

// TODO: Put user code to initialize the page here

end;

procedure TWebForm1.OnInit(e: EventArgs);

begin

// Required for Designer support

InitializeComponent;

inherited OnInit(e);

end;

procedure TWebForm1.Button1_Click(sender: System.Object; e: System.EventArgs);

begin

Label3.Text := Request.Params['txtUserName'];

end;

end.

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tracey Maule
Sent: Tuesday, 3 February 2004 9:38 a.m.
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] display value of form1.txtbox in form2.txtbox

O thanks for replying James, I was beginning to wonder if I was doomed to start controversial conversations but never get an answer lol

If by ASP.NET controls you mean the "Web Controls", yes I have tried them. Twice. And have had different errors each time.

Most commonly I get "Undeclared identifier: "txtWhateverItsNamed" on compile.

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Re: [DUG] display value of form1.txtbox in form2.txtbox

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