Bugs and Suggestions

gggustafson wrote:

But to someone like myself, who prides themselves in a professional looking response, the HTML input features would provide desired formatting features

1. You want formatting in the comments area.
2. I want commenting to be brief, short, unobtrusive, and restricted to the minimum necessary to allow a sensible action (provide an answer or close the question) to be carried out.
3. You've mentioned you want indenting, syntax colourising and inline formatting (B/U/I), plus (I assume) auto-linking.
4. I've asked to see a sample of a comment that would benefit from this.

1. see a comment that justifies formatting, or even a subset of the formatting
2. see an example that will allow me to explain why that comment shouldn't be formatted or should not be posted as a comment (maybe the question or answer should, in fact, be edited by you directly)
3. see a use case that our system does not handle well enough
4. see a use that shows we've not been clear enough on how to use the system
5. all or none or some of the above

You never create the file named pathString. Therefore both of the tests

if ( System.IO.File.Exists ( pathString ) )

fail. That means your program does nothing.

What are you trying to do?

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I think you may be a little confused by autocomplete TextBoxes, ComboBoxes, and ListBoxes. An autocomplete TextBox does not operate the way you suggest. No KeyDown event needs to be provided; just the list of entries that autocomplete will provide. That list can be dynamic. See the MSDN article https://msdn.microsoft.com/en-us/library/system.windows.forms.textbox.autocompletemode(v=vs.90).aspx.

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https://social.msdn.microsoft.com/Forums/vstudio/en-US/2a14478a-b330-4e0e-9b4a-e137305067af/change-wav-playback-speed

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It appears that your text-to-speech conversion is the culprit. Have you tried a different TTS engine? When I was working on the Improved Precision Approach Radar Trainer (IPART)<\a> project, I found that TTS engines varied gratly in performance. 

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See http://www.codeproject.com/Articles/15187/Concatenating-Wave-Files-Using-C-2005.

 If that doesn't do, Google "c# append .wav files". There are many suggestions there.