How to show non printable characters in a listbox

I am capturing a string of data that has some no printable characters from a COM bus. I capture them with a string variable and then display them inside my listbox window.

I put breakpoints on the string variable after a capture the complete data from the COM bus and I see the non-printables in the watch window. However I don't see the non printable inside the listbox control.

Any ideas would be appreciated

Thanks in advance.
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kaufmed   ( ⚆ _ ⚆ )Commented:
However I don't see the non printable inside the listbox control.
There is a reason they are called "non-printable" characters. "Printable" in this context does not mean that they won't go to a printer; it means that they won't be visible anywhere. If you want to see them, then you need to come up with your own visualization system, similar to what Notepad++ does.

Miguel OzSenior Software EngineerCommented:
It depends what are you trying to capture as information. In the past I used to convert the incoming string to an hexadecimal string
var hexString = string.Join("", input.Select(c => ((int)c).ToString("X2")));

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then you can view both strings side to side if needed but I only needed the hex string to play back messages for testing.

If you need to convert from and to hex see FrancSpike  code in this link
cmdolcetAuthor Commented:

I am trying to capture the received value and its CRLF at the end of the message packet.

I capture the value just fine, but the CRLF is what I am having an issue with.

So I dont need to convert anything I just need it to appear in the listbox.
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cmdolcetAuthor Commented:
Miguel and Kaufmed,

I guess a screen shot would be better explained. Please see the attached file. What I would like to do is translate this non-printable (CR) to a {CR} in the window.
kaufmed   ( ⚆ _ ⚆ )Commented:
I don't believe ListBox supports carriage return/newline in its display. Is this WinForms or WPF?
cmdolcetAuthor Commented:
This is a WindForm. How can I convert the non printable to something readable?
kaufmed   ( ⚆ _ ⚆ )Commented:
It should be as simple as a replace if you want a straight textual representation:

string updated = source.Replace("\r", "{\\r}")
                       .Replace("\n", "{\\n}");

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If you want something fancier, like what I showed in my N++ screenshot, then you'd have to draw your own control, which is much more complex.

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