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If you just want to add them to the common dialogue filter, then you just add the entries between pipe symbols...
All one line though:
Form1!CommonDialog.Filter = "Text(*.txt)|*.txt|Word Documents (*.doc)|*.doc|All Files (*.*)|*.*"
Set the Filter index to the one you want to be default when the cdl pops up...
1=.txt
2=.doc
3=.*
in this case
One you have the file name you need to open it using one of the file handling styles...depending on how the file was written this is different.
I suggest you look into the RichTextBox control rather than the simple TextBox.....
It makes it possible to save lots of other things about the text, like font, fontsize, color, underlines, etc...
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