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using System;
using System.Xml;
using System.Windows.Forms;
using System.Configuration;
using System.IO;
using System.Reflection;

namespace System.Configuration
{
    public class ConfigurationSettings 
    {
        private static string configFileName;
        private const string DEFAULT_SECTION = "appSettings";

        static ConfigurationSettings()
        {
            string AppPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
            string EXEName = Assembly.GetExecutingAssembly().GetName().Name;
            configFileName = Path.Combine(AppPath, EXEName) + ".exe.config";
        }

        public static string Get(string Key)
        {
            return Get(Key, DEFAULT_SECTION);
        }

        public static string Get(string Key, string Section) 
        {
            string str = string.Empty;
            XmlDocument doc = new XmlDocument();
            doc.Load(configFileName);
            string nodeKey = "//" + Section + "/add[@key='" + Key + "']/@value";
            if (doc.DocumentElement.SelectSingleNode(nodeKey) != null)
                str = doc.DocumentElement.SelectSingleNode(nodeKey).Value;
            
            return str;
        }

        public static void Set(string Key, string Value)
        {
            Set(Key, DEFAULT_SECTION, Value);
        }

        public static void Set(string Key, string Section, string Value) 
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(configFileName);
            string nodeKey = "//" + Section + "/add[@key='" + Key + "']/@value";
            if (doc.DocumentElement.SelectSingleNode(nodeKey) != null)
            {
                doc.DocumentElement.SelectSingleNode(nodeKey).Value = Value;
            }
            else
            {
                XmlElement add = doc.CreateElement("add");
                XmlAttribute attrkey = doc.CreateAttribute("key");
                attrkey.Value = Key;
                XmlAttribute val = doc.CreateAttribute("value");
                val.Value = Value;
                add.Attributes.Append(attrkey);
                add.Attributes.Append(val);
                doc.DocumentElement.SelectSingleNode("//" + Section).AppendChild(add);
            }
            doc.Save(configFileName); 
        } 
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="SettingName" value="SettingValue" />
  </appSettings>
</configuration>

//Legge un valore.
string value = ConfigurationSettings.Get("SettingName");
//Scrive un valore.
ConfigurationSettings.Set("SettingName", "NewValue");