In case you find yourself parsing a string with unrecognizable ASCII character codes, use the regex below to replace them. The pattern matches only the valid keyboard symbols.

string st = 
"45857875-08-545-K TESTDOCS INC 2008010320080103184514184516184516

 0 "; 
 
st = Regex.Replace(st, @"[^\x20-\x7E]", "");