using System;

Config.Port = 52;
var connection = Config.GetConnection();
//connection is "10.0.0.1:52"
Console.WriteLine(connection);

Config.Host = "10.0.0.3";
connection = Config.GetConnection();
//connection is "10.0.0.3:52"
Console.WriteLine(connection);

Console.WriteLine(Config.MaxConnections);

class Config {
    //type constant
    public static readonly int MaxConnections = 3;

    //type fields
    public static string Host;
    public static int Port;

    //type method
    public static string GetConnection() {
        return $"{Host}:{Port}";
    }

    //type constructor
    static Config() {
        Host = "10.0.0.1";
    }
}