我应该如何在C#(格式/类型)中存储设置？

Properties.Settings.Default.MySetting = "New Value";
Properties.Settings.Default.Save();
string mySetting = Properties.Settings.Default.MySetting;

<?xml version="1.0" encoding="utf-8" ?><Settings>
 <Setting Name="MySetting" Value="Default Value" />
</Settings>

XDocument settingsDoc = XDocument.Load("Settings.xml");
string mySetting = settingsDoc.Descendants("Setting").FirstOrDefault(s => s.Attribute("Name").Value == "MySetting").Attribute("Value").Value;

XElement mySettingElement = settingsDoc.Descendants("Setting").FirstOrDefault(s => s.Attribute("Name").Value == "MySetting");
mySettingElement.Attribute("Value").SetValue("New Value");
settingsDoc.Save("Settings.xml");