Read and write existing xml file trouble !

Question

Hi everyone ! 
i'm trying to save hight score of user in my game by using a xml file , in my xml file has element <best_score>0<best_score/>
and my code to do it is : 
 XElement best=XElement.Load("Assets/best.xml");
            IEnumerable<XElement> loc = best.Elements("best_score");
            foreach (XElement elem in loc)
                int check=Convert.ToInt32(elem.Value.ToString());
                int score_user = Convert.ToInt32(scores.ToString());
                if (score_user >= check)
                   hight_score.Text = score.ToString();
                     elem.Value = scores.ToString();
                     // what code to save this  xml file  after modify ?????
                else
                    list_box.Text = check.ToString();
i down know what method can help me save my xml file after update hight score of user in this case .  
Anyone has an idea to solve it for me ? please , thanks you ! 
sorry about my english ! 

Answer 1

Hi,
It is not recommended to update a file withing the project, so you need to store it in the IsolatedStorage.
Here is a sample to read and write file in IsolatedStorage,
XDocument xDoc;
var file = Util.ReadFile("XMLFile.xml");
if (file != null)
xDoc = XDocument.Parse(file);
var bestScore = xDoc.Element("best_score").Value;
//do calculation
xDoc.Element("best_score").Value = "200";
Util.SaveFile("XMLFile.xml", xDoc.ToString());
For the above code to work, you need to have a file named "XMLFile.xml" in your IsolatedStorage, with data as  "<best_scrore>200</best_scrore>"
To read and write file:
public static class Util
public static void SaveFile(string filename, string data)
try
using (var store = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication())
using (var stream = new IsolatedStorageFileStream(filename, FileMode.Create, FileAccess.ReadWrite, store))
StreamWriter writer = new StreamWriter(stream);
writer.Write(data);
writer.Close();
catch (Exception)
Debug.WriteLine("Couldn't save the file.");
public static string ReadFile(string filename)
try
String data;
if (!IsolatedStorageFile.GetUserStoreForApplication().FileExists(filename)) return null;
using (var store = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication())
using (var stream = new IsolatedStorageFileStream(filename, FileMode.Open, FileAccess.ReadWrite, store))
StreamReader stmReader = new StreamReader(stream);
data = stmReader.ReadToEnd();
stmReader.Close();
return data;
catch (Exception)
return null;
Pradeep AJ