[C#] Dynamic Config Class

using Newtonsoft.Json;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;

class Config
{
    // Config starts here

    public static string Username = "Spieler";
    public static int Port = 28282;


    // End of config, don't change anything below
    static BindingFlags bindingFlags = BindingFlags.Public | BindingFlags.Static;
    static FileInfo configFileInfo = new FileInfo(Constant.ConfigFile);

    public static void Load()
    {
        // Check if file existts
        if (!configFileInfo.Exists)
            return;

        // Deserialize from file
        var json = File.ReadAllText(configFileInfo.FullName, Encoding.ASCII);
        var jObject = JsonConvert.DeserializeObject<Config>(json);

        // Create temp config
        var tmpConf = new Dictionary<string, object>();
        foreach (var field in jObject.GetType().GetFields(bindingFlags))
            tmpConf.Add(field.Name, field.GetValue(null));

        // Load values from temp config
        foreach (var field in typeof(Config).GetFields(bindingFlags))
            field.SetValue(field.Name, tmpConf[field.Name]);
    }

    public static void Save()
    {
        // Create configwith values
        var tmpConf = new Dictionary<string, object>();
        foreach (var v in typeof(Config).GetFields(bindingFlags))
            tmpConf[v.Name] = v.GetValue(null);

        // Serialize to file
        var json = JsonConvert.SerializeObject(tmpConf, Formatting.Indented);
        File.WriteAllText(configFileInfo.FullName, json);
    }
}

Config.Load();

Console.WriteLine(Config.Username);
Config.Username = "Another Username";
Console.writeLine(Config.Username);

Config.Save();

Dictionary<String, Object> config = new Dictionary<String, Object>();

using(FileStream fs = new FileStream("file.dat", FileMode.Create)){
   BinaryFormatter bf = new BinaryFormatter();
   bf.Serialize(fs, config);
}

using(FileStream fs = new FileStream("file.dat", FileMode.Open)){
   BinaryFormatter bf = new BinaryFormatter();
   config = (Dictionary<String, Object>)bf.Deserialize(fs);
}

protected Person(SerializationInfo info, StreamingContext context)
        {
            if (info == null)
                throw new System.ArgumentNullException("info");
            name_value = (string)info.GetValue("AltName", typeof(string));
            ID_value = (int)info.GetValue("AltID", typeof(int));
        }

public virtual void GetObjectData(
        SerializationInfo info, StreamingContext context)
        {
            if (info == null)
                throw new System.ArgumentNullException("info");
            info.AddValue("AltName", "XXX");
            info.AddValue("AltID", 9999);
        }