I want one character to escape IsLetterOrDigit

Question

I have the following function that checks a string and keeps only the letters and digits. All other characters are removed.

However I want one character only "-" to escape this function and not to be removed. For instance I want Jean-Paul to stay as it with the "-" in between the two names. How can I do that?

String NameTextboxString = NameTextbox.Text;
NameTextboxString = new string((from c in NameTextboxString
                                where char.IsLetterOrDigit(c) 
                                select c).ToArray);
nameLabel.Text = NameTextboxString;

Answer 1

You may try:

where char.IsLetterOrDigit(c) || c == '-'

Hoping that the user will not input string like --lolol-i-am-an-hackerz--

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To simplify a bit your code:

nameLabel.Text = new string(NameTextbox.Text.Where((c => char.IsLetterOrDigit(c) || c == '-')).ToArray());