.net - How to replace extended ASCII characters in C#? -

i trying replace non-printable characters ie extended ascii characters huge string.

foreach (string line in file.readlines(txtfilename.text))             {                 messagebox.show( regex.replace(line,               @"\p{cc}",               => string.format("[{0:x2}]", " ")             )); ;              } 

this doesnt seem working.

ex: aaÂaa should converted aa aa

assuming encoding utf8 try this:

string strreplacedval = encoding.ascii.getstring(         encoding.convert(             encoding.utf8,             encoding.getencoding(                 encoding.ascii.encodingname,                 new encoderreplacementfallback(" "),                 new decoderexceptionfallback()                 ),             encoding.utf8.getbytes(line)         ) );