How to run Minecraft from a different folder [closed]

Question

My problem is that I can run minecraft from a different folder, but when I run it, it is still using .minecraft folder. It saves the worlds there and so on. How can I run it like "everything get from and save to my folder"? I heard you can mod it to run from somewhere else, but I did not found it anywhere.

        public static string generateSession(string username, string password, int clientVer)
    {
        return httpGET("https://login.minecraft.net?user=" + username + "&password=" + password + "&version=" + clientVer);
    }

    private static string httpGET(string URI)
    {
        WebRequest req = WebRequest.Create(URI);
        WebResponse resp = req.GetResponse();
        StreamReader sr = new StreamReader(resp.GetResponseStream());
        return sr.ReadToEnd().Trim();
    }

    public static void startMinecraft(bool mode, int ramMin, int ramMax, string username, string sessionID, bool debug, int modpack)
    {
        string appPath = Path.GetDirectoryName(Application.ExecutablePath) + @"\";
        string appData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\";
        string mcFolder;
        //Launching a modpack
        if (modpack == 0)
            mcFolder = @".gslauncher\vanilla";
        else mcFolder = @".gslauncher\gstech";
        Process proc = new Process();
        if (debug == true)
            proc.StartInfo.FileName = "java";
        else
            proc.StartInfo.FileName = "javaw";
        //Online and offline modes
        if (mode == true)
            proc.StartInfo.Arguments = "-Xms" + ramMin + "m -Xmx" + ramMax + "m -Djava.library.path=" + appData + mcFolder + "/bin/natives -cp " + appData + mcFolder + "/bin/minecraft.jar;" + appData + mcFolder + "/bin/jinput.jar;" + appData + mcFolder + "/bin/lwjgl.jar;" + appData + mcFolder + "/bin/lwjgl_util.jar net.minecraft.client.Minecraft " + username + " " + sessionID;
        else
            proc.StartInfo.Arguments = "-Xms" + ramMin + "m -Xmx" + ramMax + "m -Djava.library.path=" + appData + mcFolder + "/bin/natives -cp " + appData + mcFolder + "/bin/minecraft.jar;" + appData + mcFolder + "/bin/jinput.jar;" + appData + mcFolder + "/bin/lwjgl.jar;" + appData + mcFolder + "/bin/lwjgl_util.jar net.minecraft.client.Minecraft " + username;
        proc.Start();
    }

Answer 1

The Minecraft modding forums is probably the best place to get answers like this. Searching there is your best bet and you can likely find the answer. I did a search there and found that someone had asked this question already. It looks like the best way is to use Magic Launcher. If you want to do it through code, I suggest you ask the question over there.