public void NeuterXml(ref string inputXml)
{
const string pattern1 = "(?i)<number>.*?</number>";
const string pattern2 = "(?i)<accNum>.*?</accNum>";
var rgx1 = new Regex(pattern1);
var rgx2 = new Regex(pattern2);
inputXml = rgx1.Replace(inputXml, "<number>xxxxxxxxxxxxxxxx</number>");
inputXml = rgx2.Replace(inputXml, "<accNum>xxxxxxxxxx</accNum>");
}