c# cmd line app - parse xmls for value and count

I have a lot of xml files and i need to parse some info out of them. here is example of a single item in the xml [login to view URL] i need to look for username and grab it and the time date. we want to iterate through all of the xmls in a single folder and get a csv out which looks something like username | time | date The onyl weird thing is not all entries in the xml will have the user attribute so we need to only look for it and count it when and if it is present