Clash Royale CLAN TAG

Need help parsing XML Files

Okay So I have 3 problems with my application atm:

Directory.GetFiles

So here is my code for problem #1 & #2:

public void patchxml()
{
string xmldir = AppDomain.CurrentDomain.BaseDirectory + @"\tmp";
string xmlfile = Directory.GetFiles(xmldir, "*.xml");
XDocument xdoc = XDocument.Load(xmlfile[0]);
//var element = xdoc.Elements("RequiredSystemVersion").Single(); not working
//element.Value = "0"; not working
//xdoc.Save(); not working
}


Here Is a sample of the xml file:

<?xml version="1.0" encoding="utf-8"?>
<ContentMeta>
<RequiredSystemVersion>335675392</RequiredSystemVersion>
<PatchId>0x01009bf0072d4800</PatchId>
</ContentMeta>


What I need to do is, that I need to change the required system version to 0 and then afterwards save the edited .xml. saving is also not working for me as I can't specify what file to save to, as the file path varies depending on the given input.

Also here is a sample of how I successfully managed to read from the xml:

string xmldir = AppDomain.CurrentDomain.BaseDirectory + @"\tmp";
string xmlfile = Directory.GetFiles(xmldir, "*.xml");


XDocument xdoc = XDocument.Load(xmlfile[0]);
foreach (var order in xdoc.Descendants("ContentMeta"))
{
string mrmk = order.Element("Min").Value;
{
keylabel.Content = mrmk;
}
}

if (keylabel.Content.Equals("4"))
{
fwlabel.Content = "4.0.0";
}


ToString()

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