how to close child forms in mdi form

Question

2.00/5 (1 vote)

See more:

Hi all,

I am working with MDI form with 25 Child forms,

Requirement: form name 1,2,3,4,5,6,7,8,9......

1. Form 1 has open.
2. If user clicked on form 2 to open.
3. We need to ask user to close form 1 are not ? If ok (form 1 will closed and form 2 will open)

Posted 7-Sep-11 21:20pm

manoharnch

Updated 7-Sep-11 21:32pm

v2

Add a Solution

Comments

Uday P.Singh 8-Sep-11 3:30am

does your form1 is your main form?

manoharnch 8-Sep-11 3:32am

yes, all 1 to 25 forms are in main MDIFORM. form1 also in MDIFORM

4 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

nagendrathecoder · Answer 1 · 2011-09-07T21:34:00

Solution 1

So what is the problem?
Like how you r opening child form, likewise you will find inbuild method to close form.

Posted 7-Sep-11 21:34pm

nagendrathecoder

Comments

manoharnch 8-Sep-11 3:37am

close(); method is not working sir.
i need to show user to form1 opened do u want to close the form1 YES NO
if YES form1 should close and form2 should open.

Md. Rashim Uddin · Answer 2 · 2011-09-07T21:41:00

Solution 3

Have a look on that

Introduction to MDI Forms with C#[^]

Posted 7-Sep-11 21:41pm

Md. Rashim Uddin

Comments

Md. Rashim Uddin 8-Sep-11 3:50am

Please go through the link and download the Demo Project....Then you might solve your problem...The demo project is working perfectly

MaulikDusara · Answer 3 · 2011-09-07T21:42:00

Solution 4

hi manoharnch,

you can get the active child window opened in your MDI form using

C#

this.ActiveMdiChild

Posted 7-Sep-11 21:42pm

MaulikDusara

OriginalGriff · Answer 4 · 2011-09-07T21:37:00

Solution 2

The easiest way is to keep a form level variable which refers to your open instance. When the user requests Form2, check, and if it is not null, then ask and close if necessary.

C#

Form1 openForm1 = null;
...
openForm1 = new Form1();
openForm1.Show();
...
if (openForm1 != null)
   {
   if (MessageBox.Show("Close it?") == DialogResult.OK)
      {
      openForm1.Close();
      Form2 f = new Form2();
      ...
      }
   }

You will also want to handle the Form1.FormClosed event to set the openForm1 variable to null again.

Posted 7-Sep-11 21:37pm

OriginalGriff

Comments

[no name] 8-Sep-11 3:48am

there is no need to keep a form level variable

OriginalGriff 8-Sep-11 3:57am

It is true you can use the MDIChildren list, but then you have to search it for an instance of the Form1 class, when it may contain other forms. Keeping a single class level instance ensures that only a single Form1 instance is open at any one time.
Your solution relies on there either being only one MDI child at a time (in which case why use MDI at all?) or that the user does not activate a different MDI child before trying to open Form2