display contents in child window

i have a parent form and a child form. i have the file open working on the parent form, but i cant show the file contents in the child window that i open.

any suggestions would be greatly appreciated.

i have attached the two class files.
Form1.cs
FormChild.cs
NJJoeG8GTAsked:
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anarki_jimbelSenior DeveloperCommented:
I copied your  GetRichTextBox() method and code to create a child form  - "openToolStripMenuItem_Click_1. It works fine.

The only problem for me - it does not like txt files, it opens only rtf files. I didn't investigate the problem.
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NJJoeG8GTAuthor Commented:
I've requested that this question be deleted for the following reason:

i did not post the question clearly.  i want to repost
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