How do I access a Child Form from a Dialog from the Main Form C#

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I have made a paint program. The main form is Form1. A Child Form, called FormCanvas, has a pictureBox with a Bitmap Image on which I do all the drawing. From the main Form1 the user can call up several Dialogs to change the Images brightness, contrast, etc. Right now these Dialogs are set up with a thumbnail preview window, so that the user can see what the changes will look like, but I want to make the changes on the actual Image. How can I access that Bitmap from such a DIalog?

Posted 10-Feb-15 6:02am

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OriginalGriff · Answer 1 · 2015-02-10T06:19:00

Solution 1

Don't. Pass the info to the main form and let it do the work.
Transferring information between two forms, Part 2: Child to Parent[^]

Posted 10-Feb-15 6:19am

OriginalGriff

Sergey Alexandrovich Kryukov · Answer 2 · 2015-02-10T06:32:00

Here is the idea: who needs MDI, ever? Why torturing yourself and scaring off your users?
Do yourself a great favor: do not use MDI at all. You can do much easier to implement design without it, with much better quality. MDI is highly discouraged even by Microsoft, in fact, Microsoft dropped it out of WPF and will hardly support it. More importantly, you will scare off all your users if you use MDI. Just don't. Please see:
http://en.wikipedia.org/wiki/Multiple_document_interface#Disadvantages[^],
How to Create MDI Parent Window in WPF?[^].

I can explain what to do instead. Please see my past answers:
How to Create MDI Parent Window in WPF? [Solution 2],
Question on using MDI windows in WPF[^],
MDIContainer giving error[^],
How to set child forms maximized, last childform minimized[^].

—SA