title: How to use Regex.Replace to Replace Two Strings at Once?
body: <p>I have the following method that is replacing a "pound" sign from the file name but I want also to be able to replace the "single apostrophe ' " at the same time. How can I do it? 
  This is the value of filename =Provider license_A'R_Ab#acus Settlements_1-11-09.xls</p>
  
  <pre><code>static string removeBadCharPound(string filename)
  {            // Replace invalid characters with "_" char.            
      //I want something like this but is NOT working 
      //return Regex.Replace(filename, "# ' ", "_");
      return Regex.Replace(filename, "#", "_");
   }
  </code></pre>