I\'ve browsed the questions with similar titles but cannot seem to find exactly what I\'m looking for,if anyone spotted a similar question kindly point me to the thread.Here is
Thats because the default namespace is blank / not specified. I'd guess that you want GetNamespaceOfPrefix:
string elementNamespace = elemet.GetNamespaceOfPrefix("xs").NamespaceName;
Although that doesn't make a whole lot of sense to be honest - I'm not really sure what you are after.