473,322 Members | 1,496 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,322 software developers and data experts.

MDI Form App

I have created a windows app form project.

I have 3 forms, the first one I have set to be MDI Parent, the other two are Child.

When I click a button to open the two child forms, how can I stop them from opening more than once.

As it is just now, the form opens however many time I click the button, but I only want them to open once.
Sep 25 '08 #1
1 1043
Curtis Rutland
3,256 Expert 2GB
What I do is make the child forms members of the parent form. Private global variables if you will:
Expand|Select|Wrap|Line Numbers
  1. public class Form1 : Form
  2. {
  3. private Form2 f2;
  4.  
  5. public Form1()
  6. {
  7. InitializeComponent();
  8. f2 = new Form2()
  9. }
  10. }
And when I want to show it, I check to see if f2 has been disposed. If it has, I make a new instance and show it, otherwise, I just focus on it.

Note: I just typed this code in by hand. I didn't copy+paste from an existing project. This is just an example.
Sep 26 '08 #2

Sign in to post your reply or Sign up for a free account.

Similar topics

3
by: John | last post by:
Dear all, It been more than 3 days I am trying to debug this program, I interpret it using activePerl and it is giving (perl -wc code_process.pl) no error syntax but when I put it online, change...
5
by: Richard Cornford | last post by:
I am interested in hearing opinions on the semantic meaning of FORM (elements) in HTML. I have to start of apologising because this question arose in a context that is not applicable to the...
4
by: Targa | last post by:
Trying to total some price fields in a form but doesnt work when all the referenced form fields dont exisit. This is for an invoice - pulled prom a database and the form doesnt always contain the...
25
by: Lyn | last post by:
Hi, I am working on a genealogy form. The only table (so far) lists everybody in the family, one record per person. Each record has an autonum ID. The parent form (frmMainForm) displays the...
19
by: Raposa Velha | last post by:
Hello to all! Does any of you want to comment the approach I implement for instantiating a form? A description and an example follow. Cheers, RV jmclopesAThotmail.com replace the AT with the...
11
by: Jozef | last post by:
I have some old code that I use from the Access 95 Developers handbook. The code works very well, with the exception that it doesn't seem to recognize wide screens, and sizes tab controls so that...
5
by: RAJ | last post by:
hi plz tell me how to know "how window is going to close"... i have to right code for X button of forms... plz telll me thanks bye
6
by: Gary Miller | last post by:
Does anyone know how to detect a modeless form on closing by the form that invoked the modeless form? form.Show();
4
by: Alex Sibilev | last post by:
Hello, I have a really weird problem I've been trying to solve it without any luck for the last couple of hours :( I'm writing a "conference board" application (quite similar to ASP.NET...
5
by: ortaias | last post by:
I have a form which calls up a second form for purposes of data entry. When closing the data entry form and returning to the main form, things don't work as expected. When I return to the main...
0
by: ryjfgjl | last post by:
ExcelToDatabase: batch import excel into database automatically...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: ArrayDB | last post by:
The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...
1
by: Defcon1945 | last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
1
by: Shællîpôpï 09 | last post by:
If u are using a keypad phone, how do u turn on JavaScript, to access features like WhatsApp, Facebook, Instagram....
0
by: af34tf | last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome former...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.