ConfigurationUtil.cs

    /// <summary>
    /// Used for configuration when different user use different settings e.g. db connection string
    /// </summary>
    public static class ConfigurationUtil
    {
        static  NameValueCollection appSettings = ConfigurationManager.AppSettings;
        static ConnectionStringSettingsCollection connectionStrings = ConfigurationManager.ConnectionStrings;

        public static string GetAppSetting(string name)
        {
            string tmpName = string.Format(@"{0}\{1}", System.Environment.MachineName, name);
            string tmpValue = appSettings[tmpName];
            if(string.IsNullOrEmpty(tmpValue))
            {
                tmpValue = appSettings[name];
            }
            return tmpValue;
        }
        public static string GetConnectionStrings(string name)
        {
            string tmpName = string.Format(@"{0}\{1}", System.Environment.MachineName, name);
            var tmpValue = connectionStrings[tmpName];
            if (tmpValue==null)
            {
                tmpValue = connectionStrings[name];
            }
            return tmpValue.ConnectionString;
        }
    }