[C#] open a form using MDI method

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Hello,
I created three forms and in each form there is a button. I managed to open the second form using MDI by putting this code:

C#

Form2 Utilisateur = new Form2();
                Utilisateur.MdiParent =this;
                Utilisateur.Show();

But now I need to open the third form being on the second form using MDI, how could I do it ?
Thank you.

What I have tried:

I did the first step. On clicking on the button of the first form it opens the second form but now I want to open the third form b clicking on the button of the second form.

Posted 4-Jul-16 5:05am

TatsuSheva

Updated 4-Jul-16 5:19am

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OriginalGriff · Answer 1 · 2016-07-04T05:19:00

Solution 1

The best way is not to.
Instead, create an event in your Form2, which its parent handles.
Your button raises the event, the parent handles it and creates the new instance in teh same way it created Form2.
This should help: Transferring information between two forms, Part 2: Child to Parent[^]

Posted 4-Jul-16 5:19am

OriginalGriff

Comments

TatsuSheva 4-Jul-16 11:35am

There is no another method ?

OriginalGriff 4-Jul-16 11:42am

None that make sense within the OOPs environment - it's all about separation of concerns.
It's really not difficult - creating an event is only a few lines of code, and signaling it is only one line! And the link includes the code to do all of that.

TatsuSheva 4-Jul-16 11:48am

In your case, it was a transfer of data but mine it is to open a form with the MDI method, do you think it will work ?

OriginalGriff 4-Jul-16 12:04pm

Of course it will!
In your case the information you are transferring is "the user asked for Form3", which just needs the event - you don't need a property in this case.

Think about it: it's the same as a TextBox signaling the TextChanged event - it doesn't care what your form does with that, it just indicates it happened.

TatsuSheva 4-Jul-16 12:14pm

Okay, I will try my best.

OriginalGriff 4-Jul-16 12:26pm

Go for it!
Get used to creating and handling events - they are really simple, but they make the whole of .NET work.
I use them so often that I wrote this:

http://www.codeproject.com/Articles/400287/A-simple-code-snippet-to-add-an-event

Which means that I add an event to a class by typing "evh" and pressing TAB twice!

TatsuSheva 4-Jul-16 13:41pm

I found the solution thank you.