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Accessing objects in other forms??

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Accessing objects in other forms?? Software design forum discussing design principles and non-language specific algorithms. Get help with logic, algebraic, or relational concepts.

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  #1  
Old January 27th, 2006, 12:55 PM
pbd22 pbd22 is offline
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Accessing objects in other forms??
hi. i am new to OO concepts...

can somebody tell me how i access objects in other forms?
so, i have form1. and it has text1, ddl1, label1, etc.
I am in form2 and i want to ba able to access all the objects on form1.

how do i do that? I am working in VB.NET/ASP.NET.

here is the form i want to access (how do i access _subject and _location from outside this form?):

thanks in advance!

Code:

<%@ Page Language="VB" MasterPageFile="~/user_calendar/user_newitem.master" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<form id="frm_newitem">
<table>
<tr>
<td valign="top" height="100%">

<table id="leftside" bgcolor="#eaeaea">

<tr>
<td>Subject:</td>
<td align="left"><input id="_subject" size="45" VALUE="" MAXLENGTH="99" />
</td>
</tr>

<tr>
<td>Location:</td>
<td align="left"><input id="_location" size="45" VALUE="" MAXLENGTH="99" /></td>
</tr>

... etc, etc ...
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  #2  
Old January 27th, 2006, 02:08 PM
Memnoch1207 Memnoch1207 is offline
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You can't access form objects from another form in ASP.NET, because ASP is stateless.

To get the values from one form to another you can do one of the following:

1) Use Server.Transfer("somepage.aspx", True)

2) Store the values in a database to access them later.

3) Store the values in a session object.
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  #3  
Old January 27th, 2006, 05:01 PM
pbd22 pbd22 is offline
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thanks
ok. thanks for the reply.

I researched sesssion objects and it looks like the way to go.

Accordingly, I have the following as a script in one page:

Code:
Public Sub Save_ServerClick(ByVal sender As System.Object, ByVal e As System.EventArgs)
        
        'page validation
        If Context.Session("_subject").ToString() = "" Then
            AlertMsg("Missing subject")
            Return
        End If

        If Context.Session("_location").ToString() = "" Then
            AlertMsg("Missing location")
            Return
        End If
            
        If Context.Session("_monthStart").ToString() = "" Then
            AlertMsg("Missing starting month")
            Return
        End If
        
        and so on ....


the script attempts to access the values input in ("_subject", "_location", and "_monthStart") on another page.

when it compiles, it stops at the first input box ("_subject") and i am told that a "NullReferenceException was Unhandled by the user code".

what am i doing wrong here?

thanks again.
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  #4  
Old January 27th, 2006, 06:02 PM
pbd22 pbd22 is offline
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oops...
just read that session objects are only good for browsers that support cookies and that isnt going to do for what i am trying to accomplish. need to appeal to all browsers so, i am going to hunt down alternative solutions...
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  #5  
Old January 28th, 2006, 05:50 PM
pbd22 pbd22 is offline
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Arrow
OK. i am still having problems with this one...

the core of my problem is that in Form1, i have input
fields that accept various values. Form2 is a bar on the
top of my page with "Save" on it (which saves the values
that were input in Form1). So, without having the save
button on the same page

1) I cant store values in the database to access them later
2) I cant access session objects
3) I am not quite sure what you mean by using Server.Transfer to communicate between forms

Maybe i am overthinking this but i am stupped here. Is it possible to save values to a database in ASP.NET with the save button on a different form? if so, could somebody explain
this - i'd really appreciate it.
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  #6  
Old January 30th, 2006, 11:30 AM
pbd22 pbd22 is offline
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anybody?
hi. does anybody have any idea on this one? thanks
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