public void GetRootDirectory()
    {
        p.Con.Open();
        Console.WriteLine("Üdv {0}!n", GetUsersFullName());
        DataTable dt = new DataTable();
        var query = "SELECT Mappa_id FROM Mappastruktúra WHERE (Parent_id IS NULL OR Parent_id = 0) AND username = @username";
        var sda = new SqlDataAdapter(query, p.Con);

        //SQL Injection Protection
        sda.SelectCommand.Parameters.AddWithValue("@username", SqlDbType.VarChar);
        sda.SelectCommand.Parameters["@username"].Value = p.Getlgduser();
        sda.Fill(dt);
        if (dt.Rows.Count == 0)
        {
            Console.WriteLine("Még nincsenek feltöltött elemek!");
        }
        else
        {
            sorszam = dt.Rows.Count;
            oszlopszam = dt.Columns.Count;

            for (int j = 0; j < sorszam; j++)
            {
                IdList.Add((int)dt.Rows[j][0]);
            }
//Thats where i get system out of range exception
                for (int i = 0; i < IdList.Count; i++)
                {
                    FolderList[i] = GetFName(IdList[i]);
                }
                Console.WriteLine("FolerList:");
                foreach (var a in FolderList)
                {
                    Console.WriteLine(a);
                }
                FolderList.Add("---------");
                FolderList.Add("Új Mappa");
                FolderList.Add("Feltöltés");
                FolderList.Add("Letöltés");
                m.DebugTable(dt);
            }
            p.Con.Close();
    }

    public string GetFName(int fname)
    {
        p.Con.Open();
        var dt = new DataTable();
        string query = "SELECT FolderName FROM Mappastruktúra WHERE Mappa_id = @mappa_id";
        string query2 = "SELECT FolderName FROM Mappastruktúra WHERE Mappa_id = @mappa_id";
        SqlCommand cmd = new SqlCommand(query,p.Con);
        //SQL Injection Protection
        cmd.Parameters.AddWithValue("@mappa_id", SqlDbType.Int);
        cmd.Parameters["@mappa_id"].Value = fname;
        try
        {
            string name = cmd.ExecuteScalar().ToString();
            p.Con.Close();
            return name;
        }
        catch (Exception e)
        {
            p.Con.Close();
            Console.WriteLine(e);
            return null;
        }