Client.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Windows.Forms;

namespace Launcher
{
    class Client
    {
        public static void updateRealmlist(string directoryPath, Server server)
        {
            string realmlistPath = ClientHelper.realmlistPath(server);
            if (!File.Exists(realmlistPath)) return;

            File.Delete(realmlistPath);

            using (StreamWriter file = new StreamWriter(realmlistPath, true))
            {
                file.WriteLine(server.realmlist);
            }
        }

        public static void clearCache(string directoryPath)
        {
            if (Directory.Exists(directoryPath))
                DirectoryHelper.clearDirectory(directoryPath);
        }
    }
}