Solved

VB.net modifying a form from another form

Posted on 2003-12-01
2
520 Views
Last Modified: 2010-05-18
I have a main form called MainScreen. I have a listbox in this MainScreen that I am trying to update from another form(form2). I am clicking a button in form2, and I want it to add something to the listbox in MainScreen. I have tried just doing MainScreen.listbox.items.add("FFFF"), but that doesn't seem to work. I have also tried creating variables of type MainScreen and doing it that way, but I get an error(Object reference not set to an instance of an object). I have also tried creating a function in MainScreen:
    Public Sub AddItemToList(ByVal listitem As String)
    mylistbox.item.add(listitem)
    End Sub
and calling that function from form2, but get that same error.

Should I be making MainScreen the parent of form2 somehow? Any help would be appreciated.
0
Comment
Question by:dnk99
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 27

Accepted Solution

by:
Dabas earned 125 total points
ID: 9855872
Hi dnk99,
I assume that somewhere in MainScreen you have something like this:

Dim f as new Form2
f.Show

To solve your problem, you need to add two lines to your program.

In form2, add the following line:

Public fMainScreen as MainScreen

In MainScreen, add the following line before f.Show:

f.FMainScreen = Me

Now you will be able to do what you want:

fMainScreen.ListBox.Items.Add("FFFF")

Dabas
0
 

Author Comment

by:dnk99
ID: 9856077
Thanks Dabas. Works perfectly.
0

Featured Post

Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A basic question.. “What is the Garbage Collector?” The usual answer given back: “Garbage collector is a background thread run by the CLR for freeing up the memory space used by the objects which are no longer used by the program.” I wondered …
A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…

729 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question