ConfigurationManager.cs

using System;
using System.Collections.Specialized;
using System.IO;
using System.Reflection;
using System.Xml;


    /// <summary>

    /// Provides access to configuration files for client applications on the .NET Compact Framework.

    /// </summary>

    public static class ConfigurationManager
    {

        #region Private Members



        private static NameValueCollection appSettings = new NameValueCollection();

        private static string configFile;



        #endregion



        #region Public Properties



        /// <summary>

        /// Gets configuration settings in the appSettings section.

        /// </summary>

        public static NameValueCollection AppSettings
        {

            get
            {

                return appSettings;

            }

        }



        #endregion



        #region Constructors



        /// <summary>

        /// Static constructor.

        /// </summary>

        static ConfigurationManager()
        {

            // Determine the location of the config file

            ConfigurationManager.configFile = String.Format("{0}.config", System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);



            // Ensure configuration file exists

            if (!File.Exists(ConfigurationManager.configFile))
            {

                throw new FileNotFoundException(String.Format("Configuration file ({0}) could not be found.", ConfigurationManager.configFile));

            }



            // Load config file as an XmlDocument

            XmlDocument myXmlDocument = new XmlDocument();

            myXmlDocument.Load(ConfigurationManager.configFile);



            // Add keys and values to the AppSettings NameValueCollection

            foreach (XmlNode appSettingNode in myXmlDocument.SelectNodes("/configuration/appSettings/add"))
            {

                ConfigurationManager.AppSettings.Add(appSettingNode.Attributes["key"].Value, appSettingNode.Attributes["value"].Value);

            }

        }



        #endregion



        #region Public Methods



        /// <summary>

        /// Saves changes made to the configuration settings.

        /// </summary>

        public static void Save()
        {

            // Load config file as an XmlDocument

            XmlDocument myXmlDocument = new XmlDocument();

            myXmlDocument.Load(ConfigurationManager.configFile);



            // Get the appSettings node

            XmlNode appSettingsNode = myXmlDocument.SelectSingleNode("/configuration/appSettings");



            if (appSettingsNode != null)
            {

                // Remove all previous appSetting nodes

                appSettingsNode.RemoveAll();



                foreach (string key in AppSettings.AllKeys)
                {

                    // Create a new appSetting node

                    XmlElement appSettingNode = myXmlDocument.CreateElement("add");



                    // Create the key attribute and assign its value

                    XmlAttribute keyAttribute = myXmlDocument.CreateAttribute("key");

                    keyAttribute.Value = key;



                    // Create the value attribute and assign its value

                    XmlAttribute valueAttribute = myXmlDocument.CreateAttribute("value");

                    valueAttribute.Value = AppSettings[key];



                    // Append the key and value attribute to the appSetting node

                    appSettingNode.Attributes.Append(keyAttribute);

                    appSettingNode.Attributes.Append(valueAttribute);



                    // Append the appSetting node to the appSettings node

                    appSettingsNode.AppendChild(appSettingNode);

                }

            }



            // Save config file

            myXmlDocument.Save(ConfigurationManager.configFile);

        }



        #endregion

    }